13232 + Interview Questions in Physics Page 52 InterviewSolution

2551.	In the following atoms and molecules, for the transition from n=2 to n=1, the spectral line of minimum wavelength will be produced by
Answer» In the following atoms and molecules, for the transition from n=2 to n=1, the spectral line of minimum wavelength will be produced by

Discussion

2552.	Question 2An electric lamp of 100Ω, a toaster of resistance 50Ω, and a water filter of resistance 500Ω are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?
Answer» Question 2 An electric lamp of $100 Ω$ , a toaster of resistance $50 Ω$ , and a water filter of resistance $500 Ω$ are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?

Discussion

2553.	Mention a few rules to be followed while writing units.
Answer» Mention a few rules to be followed while writing units.

Discussion

2554.	The position of a particle is given as x=6t^{2 }+5t a)Calculate its initial velocity b)What is its acceleration when time is 4s
Answer» The position of a particle is given as x=6t^{2 }+5t a)Calculate its initial velocity b)What is its acceleration when time is 4s

Discussion

2555.	A man of mass 60 Kg is standing on the floor holding a stone weighing 40N. What is the force with which the floor is pushing him up?(g=10 ms−2)
Answer» A man of mass 60 Kg is standing on the floor holding a stone weighing 40N. What is the force with which the floor is pushing him up?(g=10 ${m s}^{- 2}$ )

Discussion

2556.	A stone is dropped from the top of Tower 500 m into a pond of water at the base of Tower. When is the splash heard at the top? ( Given g=10m\s2 and speed of sound=340m\s
Answer» A stone is dropped from the top of Tower 500 m into a pond of water at the base of Tower. When is the splash heard at the top? ( Given g=10m\s²and speed of sound=340m\s

Discussion

2557.	An ant takes 5 s to complete one round trip along a circular path. How much time will it take for the ant to travel along the diameter of the circle and come back? Assume that the speed of the ant is constant throughout the process.
Answer» An ant takes $5 s$ to complete one round trip along a circular path. How much time will it take for the ant to travel along the diameter of the circle and come back? Assume that the speed of the ant is constant throughout the process.

Discussion

2558.	An observer while going on scooter hears sound of two sirens of same frequencies from two opposite directions. If he travels along the direction of one of the siren, then he
Answer» An observer while going on scooter hears sound of two sirens of same frequencies from two opposite directions. If he travels along the direction of one of the siren, then he

Discussion

2559.	Two straight infinitely long thin wires are spaced 0.1 m apart and carry a current of 10 ampere each. Find the magnetic field at a point 0.1m from both the wires in the two cases when the currents are in the :A) same directionB) opp direction
Answer» Two straight infinitely long thin wires are spaced 0.1 m apart and carry a current of 10 ampere each. Find the magnetic field at a point 0.1m from both the wires in the two cases when the currents are in the : A) same direction B) opp direction

Discussion

2560.	[Forwarded from nishant nepali]A source of sound ( velocity = 330 m/s ) produce waves in frequency range 500hz to 6600hz. Find the wavelength range of sound produced.
Answer» [Forwarded from nishant nepali] A source of sound ( velocity = 330 m/s ) produce waves in frequency range 500hz to 6600hz. Find the wavelength range of sound produced.

Discussion

2561.	The main busbars in a generating station are divided into four section, each section being connected to a tie bar through a similar reactor. One 20 MVA, 11 kV generator having substransient reactance 20% is connected to each section bus bar. When a symmetrical fault takes place between the phases of one of the section busbar, the voltage on the remaining section falls to 65% of the normal value. The reactance of each reactors is _____ ohms.0.556
Answer» The main busbars in a generating station are divided into four section, each section being connected to a tie bar through a similar reactor. One 20 MVA, 11 kV generator having substransient reactance 20% is connected to each section bus bar. When a symmetrical fault takes place between the phases of one of the section busbar, the voltage on the remaining section falls to 65% of the normal value. The reactance of each reactors is _____ ohms. 0.556

Discussion

2562.	Which one of the following diseases is due to the low converging power of the lens?
Answer» Which one of the following diseases is due to the low converging power of the lens?

Discussion

2563.	Explain how do bats locate the obstacles and prey in their way.
Answer» Explain how do bats locate the obstacles and prey in their way.

Discussion

2564.	Question 1Why are the ceilings of concert halls curved?
Answer» Question 1 Why are the ceilings of concert halls curved?

Discussion

2565.	An object travels around a circle of radius 6 m with speed 3πms. Find the distance and displacement after 3 s.
Answer» An object travels around a circle of radius 6 m with speed $3 π \frac{m}{s}$ . Find the distance and displacement after 3 s.

Discussion

2566.	Consider three charges q_1,q_2,q_3 each equal to q at the vertices of an equilateral triangle of side L. What is the force on a charge Q(with the same sign as q) placed at the centrioid of the triangle?
Answer» Consider three charges q_1,q_2,q_3 each equal to q at the vertices of an equilateral triangle of side L. What is the force on a charge Q(with the same sign as q) placed at the centrioid of the triangle?

Discussion

2567.	Question 82 (ii) Meterology one measure of average global temperature shows hwo each year varies from a base measure. The table shows results for several years. Year19581964196519782002Difference from base0.10∘C−0.17∘C−0.10∘C(150)∘C0.54∘ See the table and answer the following: In 1946 the average temperature varied by−0.03∘C from the base measure. Between which two years should 1946 fall, when the years are ordered from coldest to warmest ?
Answer» Question 82 (ii) Meterology one measure of average global temperature shows hwo each year varies from a base measure. The table shows results for several years. $\begin{matrix} Y e a r & 1958 & 1964 & 1965 & 1978 & 2002 D i f f e r e n c e f r o m b a s e & {0.10}^{\circ} C & - {0.17}^{\circ} C & - {0.10}^{\circ} C & {(\frac{1}{50})}^{\circ} C & {0.54}^{\circ} \end{matrix}$ See the table and answer the following: In 1946 the average temperature varied by $- {0.03}^{\circ} C$ from the base measure. Between which two years should 1946 fall, when the years are ordered from coldest to warmest ?

2567.

Question 82 (ii) Meterology one measure of average global temperature shows hwo each year varies from a base measure. The table shows results for several years. Year19581964196519782002Difference from base0.10∘C−0.17∘C−0.10∘C(150)∘C0.54∘ See the table and answer the following: In 1946 the average temperature varied by−0.03∘C from the base measure. Between which two years should 1946 fall, when the years are ordered from coldest to warmest ?

Answer»

Question 82 (ii)

Meterology one measure of average global temperature shows hwo each year varies from a base measure. The table shows results for several years.
$\begin{matrix} Y e a r & 1958 & 1964 & 1965 & 1978 & 2002 D i f f e r e n c e f r o m b a s e & {0.10}^{\circ} C & - {0.17}^{\circ} C & - {0.10}^{\circ} C & {(\frac{1}{50})}^{\circ} C & {0.54}^{\circ} \end{matrix}$
See the table and answer the following:
In 1946 the average temperature varied by $- {0.03}^{\circ} C$ from the base measure. Between which two years should 1946 fall, when the years are ordered from coldest to warmest ?

Discussion

2568.	Among which of the following situations the object(s) is/are in free fall?1. An object dropped from a certain height.2. An object is thrown upward or a person jumping off the ground.3. Flying in a aircraft.4. A car accelerating at 9.8 ms−2in the road.
Answer» Among which of the following situations the object(s) is/are in free fall? 1. An object dropped from a certain height. 2. An object is thrown upward or a person jumping off the ground. 3. Flying in a aircraft. 4. A car accelerating at $9.8 m s^{- 2}$ in the road.

2568.

Among which of the following situations the object(s) is/are in free fall?1. An object dropped from a certain height.2. An object is thrown upward or a person jumping off the ground.3. Flying in a aircraft.4. A car accelerating at 9.8 ms−2in the road.

Answer»

Among which of the following situations the object(s) is/are in free fall?

1. An object dropped from a certain height.

2. An object is thrown upward or a person jumping off the ground.

3. Flying in a aircraft.

4. A car accelerating at $9.8 m s^{- 2}$ in the road.

Discussion

2569.	Q) HOW MANY NEUTRAL POINTS ARE OBTAINED WHEN A BAR MAGNET IS PLACED IN THE MAGNETIC MERIDIAN WITH ITS NORTH POLE POINTING TOWARDS: a. north pole of the earth b. south pole of the earth
Answer» Q) HOW MANY NEUTRAL POINTS ARE OBTAINED WHEN A BAR MAGNET IS PLACED IN THE MAGNETIC MERIDIAN WITH ITS NORTH POLE POINTING TOWARDS: a. north pole of the earth b. south pole of the earth

Discussion

2570.	Kushagra has made the following arrangement for his school project, in which he has to light the bulb. The bulb will not glow if the ends A and B are connected with:
Answer» Kushagra has made the following arrangement for his school project, in which he has to light the bulb. The bulb will not glow if the ends A and B are connected with:

Discussion

2571.	If a current carrying conductor is placed in the east-west direction, then find the direction of the force experienced by the conductor due to Earth's magnetic field.
Answer» If a current carrying conductor is placed in the east-west direction, then find the direction of the force experienced by the conductor due to Earth's magnetic field.

Discussion

2572.	how to prove {\sqrt{3 }}_{}/4 a^{2 } by herons formula
Answer» how to prove {\sqrt{3 }}_{}/4 a^{2 } by herons formula

Discussion

2573.	A car accelerating from rest at 2.0 m/s^{2 }for 5 sec , then find the average speed of the car ?
Answer» A car accelerating from rest at 2.0 m/s^{2 }for 5 sec , then find the average speed of the car ?

Discussion

2574.	A satellite in a force free space sweeps stationary interplanetary dust at a rate dMdt=αv, where M is the mass and v is the velocity of the satellite and α is a constant. The acceleration of the satellite is
Answer» A satellite in a force free space sweeps stationary interplanetary dust at a rate $\frac{d M}{d t} = α v$ , where M is the mass and v is the velocity of the satellite and $α$ is a constant. The acceleration of the satellite is

Discussion

2575.	Find the measurement of the screw gauge for the figure shown below:
Answer» Find the measurement of the screw gauge for the figure shown below:

2575.

Find the measurement of the screw gauge for the figure shown below:

Answer»

Find the measurement of the screw gauge for the figure shown below:

Discussion

2576.	A signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station ? The signal travels at the speed of light, that is 3×108 m/s.
Answer» A signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station ? The signal travels at the speed of light, that is $3 \times 10^{8}$ m/s.

Discussion

2577.	3 kg of coal liberates 6000 kJ of heat on combustion. Find its calorific value.2000
Answer» 3 kg of coal liberates 6000 kJ of heat on combustion. Find its calorific value. 2000

Discussion

2578.	20. The power required by engine of car of mass1000 kg to accelerate it from rest to a speed of72 km/h in 20 s is
Answer» 20. The power required by engine of car of mass1000 kg to accelerate it from rest to a speed of72 km/h in 20 s is

Discussion

2579.	For carrying out the experiment, on finding the equivalent resistance of two resistors connected in series, a student sets up the circuit as shown. On further verification, he finds out that the circuit has one or more of the following faults: (i) The resistors R1 and R2 have not been correctly connected in series(ii) The voltmeter has not been correctly connected in the circuit(iii) The ammeter has not been correctly connected in the circuitOut of these three, the actual fault in the circuit is/are:
Answer» For carrying out the experiment, on finding the equivalent resistance of two resistors connected in series, a student sets up the circuit as shown. On further verification, he finds out that the circuit has one or more of the following faults: (i) The resistors R₁ and R₂ have not been correctly connected in series (ii) The voltmeter has not been correctly connected in the circuit (iii) The ammeter has not been correctly connected in the circuit Out of these three, the actual fault in the circuit is/are:

2579.

For carrying out the experiment, on finding the equivalent resistance of two resistors connected in series, a student sets up the circuit as shown. On further verification, he finds out that the circuit has one or more of the following faults: (i) The resistors R1 and R2 have not been correctly connected in series(ii) The voltmeter has not been correctly connected in the circuit(iii) The ammeter has not been correctly connected in the circuitOut of these three, the actual fault in the circuit is/are:

Answer»

For carrying out the experiment, on finding the equivalent resistance of two resistors connected in series, a student sets up the circuit as shown. On further verification, he finds out that the circuit has one or more of the following faults:

(i) The resistors R₁ and R₂ have not been correctly connected in series

(ii) The voltmeter has not been correctly connected in the circuit

(iii) The ammeter has not been correctly connected in the circuit

Out of these three, the actual fault in the circuit is/are:

Discussion

2580.	A bullet of mass 100 g is shot at a velocity of 1000 km hr−1 towards the target. What would be its kinetic energy?
Answer» A bullet of mass $100 g$ is shot at a velocity of $1000 k m h r^{- 1}$ towards the target. What would be its kinetic energy?

Discussion

2581.	Why electrons don't lose energy even when revolving around the nucleus of the atom? Is this a contradiction to the electromagnetic theory of physics?
Answer» Why electrons don't lose energy even when revolving around the nucleus of the atom? Is this a contradiction to the electromagnetic theory of physics?

Discussion

2582.	1 kg piece of copper is drawn into a wire 1 mm2 thick, and another 1 kg copper piece into a wire 2 mm2 thick. Ratio of resistances respectively is
Answer» $1 k g$ piece of copper is drawn into a wire $1 m m^{2}$ thick, and another $1 k g$ copper piece into a wire $2 m m^{2}$ thick. Ratio of resistances respectively is

Discussion

2583.	A man weighs 80 N on the surface of the earth of radius R. At what height above the surface of the earth, his weight will be 40N?
Answer» A man weighs 80 N on the surface of the earth of radius R. At what height above the surface of the earth, his weight will be $40 N ?$

Discussion

2584.	88.How to caluculate relative velocity with angle
Answer» 88.How to caluculate relative velocity with angle

Discussion

2585.	A block of mass m is pulled along a horizontalfrictionless surface by a rope of mass m. If a forceF is applied at the free end of the rope, the forceexerted by the rope on the block is6.m2(2) m-m2m2F(1) m,+ m2-F(4) m-m2-F(3) m,+ m2Three blocks are connected to each other with light7inextensible strings as shown in the figure givenbelow. Tension T, and T, are respectively2110 kg7 kg3 kgTZTT2100 N20 N(2) 20 N, 100 N(1) 100 N, 20N(4) 32 N, 60 N(3) 60 N, 32 N
Answer» A block of mass m is pulled along a horizontalfrictionless surface by a rope of mass m. If a forceF is applied at the free end of the rope, the forceexerted by the rope on the block is6.m2(2) m-m2m2F(1) m,+ m2-F(4) m-m2-F(3) m,+ m2Three blocks are connected to each other with light7inextensible strings as shown in the figure givenbelow. Tension T, and T, are respectively2110 kg7 kg3 kgTZTT2100 N20 N(2) 20 N, 100 N(1) 100 N, 20N(4) 32 N, 60 N(3) 60 N, 32 N

Discussion

2586.	A ray of light is incident on a glass-water interface at an angle i, it merges finally parallel to the surface of the water as shown in the figure, the value of μg would be:
Answer» A ray of light is incident on a glass-water interface at an angle i, it merges finally parallel to the surface of the water as shown in the figure, the value of $μ_{g}$ would be:

Discussion

2587.	A source of power 600 kilowatt and its photos on which incident on a surface of 2.5m away out of which 50% is reflected back what is the radiation pressure on surface
Answer» A source of power 600 kilowatt and its photos on which incident on a surface of 2.5m away out of which 50% is reflected back what is the radiation pressure on surface

Discussion

2588.	Density of water is maximum at : (a) 0∘C (b) 100∘C (c) 4∘C (d) 15∘C
Answer» Density of water is maximum at : (a) $0^{\circ} C$ (b) $100^{\circ} C$ (c) $4^{\circ} C$ (d) $15^{\circ} C$

2588.

Density of water is maximum at : (a) 0∘C (b) 100∘C (c) 4∘C (d) 15∘C

Answer»

Density of water is maximum at :

(a) $0^{\circ} C$ (b) $100^{\circ} C$

(c) $4^{\circ} C$ (d) $15^{\circ} C$

Discussion

2589.	How does Galelio's theory prove true that every thing's basic state is rest because we are all moving right now?
Answer» How does Galelio's theory prove true that every thing's basic state is rest because we are all moving right now?

Discussion

2590.	26.A thin rod of mass M and length L is bent to form a closed semicircle with a diameter portion too. the moment of inertia about the axis AB that is along the diameter is
Answer» 26.A thin rod of mass M and length L is bent to form a closed semicircle with a diameter portion too. the moment of inertia about the axis AB that is along the diameter is

Discussion

2591.	85.A body is projected with a velocity v = (3i+4j)m/s. The maximum height attained by the body is :(g=10m/s2)
Answer» 85.A body is projected with a velocity v = (3i+4j)m/s. The maximum height attained by the body is :(g=10m/s2)

Discussion

2592.	if the density and the radius of the earth are doubled , then the accelaratin due to gravity will be
Answer» if the density and the radius of the earth are doubled , then the accelaratin due to gravity will be

Discussion

2593.	How the speed of sound is connected with the density of an object
Answer» How the speed of sound is connected with the density of an object

Discussion

2594.	Can't we draw a graph of longitudinal wave as that of a transverse wave.
Answer» Can't we draw a graph of longitudinal wave as that of a transverse wave.

Discussion

2595.	Question 03.6Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your Solution in each case.Piece of paper
Answer» Question 03.6 Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your Solution in each case. Piece of paper

Discussion

2596.	If the object moves with a constant standard velocity of 50 km/hr for two hours. What is its instantaneous velocity after 30 minutes from the time it started?
Answer» If the object moves with a constant standard velocity of $50 km/hr$ for two hours. What is its instantaneous velocity after $30 minutes$ from the time it started?

Discussion

2597.	What happens when a passenger in a moving train tosses a coin, when the train is 1- accelerating 2- moving with a constant speed 3- negatively accelerating
Answer» What happens when a passenger in a moving train tosses a coin, when the train is 1- accelerating 2- moving with a constant speed 3- negatively accelerating

2597.

What happens when a passenger in a moving train tosses a coin, when the train is 1- accelerating 2- moving with a constant speed 3- negatively accelerating

Answer»

What happens when a passenger in a moving train tosses a coin, when the train is

1- accelerating

2- moving with a constant speed

3- negatively accelerating

Discussion

2598.	What is the other name of buoyant force ?
Answer» What is the other name of buoyant force ?

Discussion

2599.	What is meant by the term buoyancy ?
Answer» What is meant by the term buoyancy ?

Discussion

2600.	The given graph shows the displacement versus time relation for a disturbance travelling with a velocity of 1500 m s−1. Calculate the wavelength of the disturbance in mm. 3
Answer» The given graph shows the displacement versus time relation for a disturbance travelling with a velocity of $1500 {m s}^{- 1}$ . Calculate the wavelength of the disturbance in $mm$ . 3

2600.

The given graph shows the displacement versus time relation for a disturbance travelling with a velocity of 1500 m s−1. Calculate the wavelength of the disturbance in mm. 3

Answer» The given graph shows the displacement versus time relation for a disturbance travelling with a velocity of

1500 {m s}^{- 1}

. Calculate the wavelength of the disturbance in

mm

.

3

Discussion

Explore topic-wise InterviewSolutions in .

In the following atoms and molecules, for the transition from n=2 to n=1, the spectral line of minimum wavelength will be produced by

Mention a few rules to be followed while writing units.

The position of a particle is given as x=6t^{2 }+5t a)Calculate its initial velocity b)What is its acceleration when time is 4s

A man of mass 60 Kg is standing on the floor holding a stone weighing 40N. What is the force with which the floor is pushing him up?(g=10 ms−2)

A stone is dropped from the top of Tower 500 m into a pond of water at the base of Tower. When is the splash heard at the top? ( Given g=10m\s2 and speed of sound=340m\s

An ant takes 5 s to complete one round trip along a circular path. How much time will it take for the ant to travel along the diameter of the circle and come back? Assume that the speed of the ant is constant throughout the process.

An observer while going on scooter hears sound of two sirens of same frequencies from two opposite directions. If he travels along the direction of one of the siren, then he

Two straight infinitely long thin wires are spaced 0.1 m apart and carry a current of 10 ampere each. Find the magnetic field at a point 0.1m from both the wires in the two cases when the currents are in the :A) same directionB) opp direction

[Forwarded from nishant nepali]A source of sound ( velocity = 330 m/s ) produce waves in frequency range 500hz to 6600hz. Find the wavelength range of sound produced.

Which one of the following diseases is due to the low converging power of the lens?

Explain how do bats locate the obstacles and prey in their way.

Question 1Why are the ceilings of concert halls curved?

An object travels around a circle of radius 6 m with speed 3πms. Find the distance and displacement after 3 s.

Consider three charges q_1,q_2,q_3 each equal to q at the vertices of an equilateral triangle of side L. What is the force on a charge Q(with the same sign as q) placed at the centrioid of the triangle?

Among which of the following situations the object(s) is/are in free fall?1. An object dropped from a certain height.2. An object is thrown upward or a person jumping off the ground.3. Flying in a aircraft.4. A car accelerating at 9.8 ms−2in the road.

Q) HOW MANY NEUTRAL POINTS ARE OBTAINED WHEN A BAR MAGNET IS PLACED IN THE MAGNETIC MERIDIAN WITH ITS NORTH POLE POINTING TOWARDS: a. north pole of the earth b. south pole of the earth

Kushagra has made the following arrangement for his school project, in which he has to light the bulb. The bulb will not glow if the ends A and B are connected with:

If a current carrying conductor is placed in the east-west direction, then find the direction of the force experienced by the conductor due to Earth's magnetic field.

how to prove {\sqrt{3 }}_{}/4 a^{2 } by herons formula

A car accelerating from rest at 2.0 m/s^{2 }for 5 sec , then find the average speed of the car ?

A satellite in a force free space sweeps stationary interplanetary dust at a rate dMdt=αv, where M is the mass and v is the velocity of the satellite and α is a constant. The acceleration of the satellite is

Find the measurement of the screw gauge for the figure shown below:

A signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station ? The signal travels at the speed of light, that is 3×108 m/s.

3 kg of coal liberates 6000 kJ of heat on combustion. Find its calorific value.2000

20. The power required by engine of car of mass1000 kg to accelerate it from rest to a speed of72 km/h in 20 s is

A bullet of mass 100 g is shot at a velocity of 1000 km hr−1 towards the target. What would be its kinetic energy?

Why electrons don't lose energy even when revolving around the nucleus of the atom? Is this a contradiction to the electromagnetic theory of physics?

1 kg piece of copper is drawn into a wire 1 mm2 thick, and another 1 kg copper piece into a wire 2 mm2 thick. Ratio of resistances respectively is

A man weighs 80 N on the surface of the earth of radius R. At what height above the surface of the earth, his weight will be 40N?

88.How to caluculate relative velocity with angle

A ray of light is incident on a glass-water interface at an angle i, it merges finally parallel to the surface of the water as shown in the figure, the value of μg would be:

A source of power 600 kilowatt and its photos on which incident on a surface of 2.5m away out of which 50% is reflected back what is the radiation pressure on surface

Density of water is maximum at : (a) 0∘C (b) 100∘C (c) 4∘C (d) 15∘C

How does Galelio's theory prove true that every thing's basic state is rest because we are all moving right now?

26.A thin rod of mass M and length L is bent to form a closed semicircle with a diameter portion too. the moment of inertia about the axis AB that is along the diameter is

85.A body is projected with a velocity v = (3i+4j)m/s. The maximum height attained by the body is :(g=10m/s2)

if the density and the radius of the earth are doubled , then the accelaratin due to gravity will be

How the speed of sound is connected with the density of an object

Can't we draw a graph of longitudinal wave as that of a transverse wave.

Question 03.6Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your Solution in each case.Piece of paper

If the object moves with a constant standard velocity of 50 km/hr for two hours. What is its instantaneous velocity after 30 minutes from the time it started?

What happens when a passenger in a moving train tosses a coin, when the train is 1- accelerating 2- moving with a constant speed 3- negatively accelerating

What is the other name of buoyant force ?

What is meant by the term buoyancy ?

The given graph shows the displacement versus time relation for a disturbance travelling with a velocity of 1500 m s−1. Calculate the wavelength of the disturbance in mm. 3