13232 + Interview Questions in Physics Page 30 InterviewSolution

1451.	The value of acceleration due to gravity on the surface of the earth is 9.8m/s^2. Find the value on the surface of the moon.given that mass of the earth is 6×10^24 kg; radius of the earth is 6.4×10^6m;mass of the moon is 7.10^24kg;and the radius of the moon is 1.74×10^6m
Answer» The value of acceleration due to gravity on the surface of the earth is 9.8m/s^2. Find the value on the surface of the moon.given that mass of the earth is 6×10^24 kg; radius of the earth is 6.4×10^6m;mass of the moon is 7.10^24kg;and the radius of the moon is 1.74×10^6m

Discussion

1452.	Why work done against the gravity is negative? [2 MARKS]
Answer» Why work done against the gravity is negative? [2 MARKS]

Discussion

1453.	Two balls are projected at different angles to acquire same horizontal range R with same initial speed u . If max height acquired by the balls are H1 and H2 resp, then (1)H1+H2=u2g (2)H1+H2= u22g (3)H1+H2=R24 (4) Both 2 and 3
Answer» Two balls are projected at different angles to acquire same horizontal range R with same initial speed u . If max height acquired by the balls are H1 and H2 resp, then (1)H1+H2= $\frac{u^{2}}{g}$ (2)H1+H2= $\frac{u^{2}}{2 g}$ (3)H1+H2= $\frac{R^{2}}{4}$ (4) Both 2 and 3

1453.

Two balls are projected at different angles to acquire same horizontal range R with same initial speed u . If max height acquired by the balls are H1 and H2 resp, then (1)H1+H2=u2g (2)H1+H2= u22g (3)H1+H2=R24 (4) Both 2 and 3

Answer»

Two balls are projected at different angles to acquire same horizontal range R with same initial speed u . If max height acquired by the balls are H1 and H2 resp, then

(1)H1+H2= $\frac{u^{2}}{g}$

(2)H1+H2= $\frac{u^{2}}{2 g}$

(3)H1+H2= $\frac{R^{2}}{4}$

(4) Both 2 and 3

Discussion

1454.	Explain the following : 1.telephone wires sag in summer 2.iron rims are heated before they are fixed on wooden wheels 3. The are left between the successive rails on a railway track 4. A cement floor is laid in small pieces with gaps in between 5. A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle
Answer» Explain the following : 1.telephone wires sag in summer 2.iron rims are heated before they are fixed on wooden wheels 3. The are left between the successive rails on a railway track 4. A cement floor is laid in small pieces with gaps in between 5. A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle

1454.

Explain the following : 1.telephone wires sag in summer 2.iron rims are heated before they are fixed on wooden wheels 3. The are left between the successive rails on a railway track 4. A cement floor is laid in small pieces with gaps in between 5. A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle

Answer»

Explain the following : 1.telephone wires sag in summer

2.iron rims are heated before they are fixed on wooden wheels

3. The are left between the successive rails on a railway track

4. A cement floor is laid in small pieces with gaps in between

5. A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle

Discussion

1455.	Two electric bulbs one of 200V-40W and other of 200V-100W are connected in series to a 200 volt line, then
Answer» Two electric bulbs one of 200V-40W and other of 200V-100W are connected in series to a 200 volt line, then

Discussion

1456.	76.Two car drivers spot each other 80 m apart. They were travelling 72 km/h & 60 km/h respectively towards each other. Both simultaneously applies brakes , which retards both cars at the rate of 5 m/s (Metre per second sqaure). There will be collision or not?
Answer» 76.Two car drivers spot each other 80 m apart. They were travelling 72 km/h & 60 km/h respectively towards each other. Both simultaneously applies brakes , which retards both cars at the rate of 5 m/s (Metre per second sqaure). There will be collision or not?

Discussion

1457.	1 newton = __ dyne.
Answer» 1 newton = __ dyne.

1457.

1 newton = __ dyne.

Answer»

1 newton = __ dyne.

Discussion

1458.	A 1000kg vehicle moving with a speed of 20m/s is brought to rest in a distance of 50 meters: (i) Find the acceleration (ii) Calculate the unbalanced force acting on the vehicle.
Answer» A 1000kg vehicle moving with a speed of 20m/s is brought to rest in a distance of 50 meters: (i) Find the acceleration (ii) Calculate the unbalanced force acting on the vehicle.

1458.

A 1000kg vehicle moving with a speed of 20m/s is brought to rest in a distance of 50 meters: (i) Find the acceleration (ii) Calculate the unbalanced force acting on the vehicle.

Answer»

A 1000kg vehicle moving with a speed of 20m/s is brought to rest in a distance of 50 meters:

(i) Find the acceleration

(ii) Calculate the unbalanced force acting on the vehicle.

Discussion

1459.	A boy weighs 600 N on the Earth. What would be his weight on the moon?
Answer» A boy weighs $600 N$ on the Earth. What would be his weight on the moon?

Discussion

1460.	Newtons second law
Answer» Newtons second law

Discussion

1461.	When astronauts go into space..there exist some gravitational force between them..so by Newton's first law of motion why the astronauts don't revolute around the earth like moon
Answer» When astronauts go into space..there exist some gravitational force between them..so by Newton's first law of motion why the astronauts don't revolute around the earth like moon

Discussion

1462.	The optical path of a monochromatic light is the same when it goes through 2.00 cm of glass or 2.25 cm of water. If the refractive index of water is 1.33. What is the refractive index of glass?
Answer» The optical path of a monochromatic light is the same when it goes through $2.00 cm$ of glass or $2.25 cm$ of water. If the refractive index of water is $1.33$ . What is the refractive index of glass?

Discussion

1463.	3 BLOCKS OF MASS 4KG,2KG AND 1 KG ARE PLACED SIDE BY SIDE ON A SMOOTH SURFACE. hORIZONTAL FORCE OF 14 N IS APPLIED ON 4 KG BLOCK THEN CONTACT FORCE BETWEEN 4 KG AND 2 KG BLOCK IS ?
Answer» 3 BLOCKS OF MASS 4KG,2KG AND 1 KG ARE PLACED SIDE BY SIDE ON A SMOOTH SURFACE. hORIZONTAL FORCE OF 14 N IS APPLIED ON 4 KG BLOCK THEN CONTACT FORCE BETWEEN 4 KG AND 2 KG BLOCK IS ?

Discussion

1464.	momenrum p ,velocity v are related p=\surd a/b+\surd v then dimensuonak formukanof ab^{
Answer» momenrum p ,velocity v are related p=\surd a/b+\surd v then dimensuonak formukanof ab^{

Discussion

1465.	64.How can mass changes with the change in the speed of a body
Answer» 64.How can mass changes with the change in the speed of a body

Discussion

1466.	At what height the acceleration due to gravity will be reduced to 36% of its value on the surface of the earth?
Answer» At what height the acceleration due to gravity will be reduced to 36% of its value on the surface of the earth?

Discussion

1467.	When does a body float on a fluid?
Answer» When does a body float on a fluid?

Discussion

1468.	What is the weight of a70kg body on the surface of a planet whose mass is 1/7th that of Earth and radius is half of the earth?
Answer» What is the weight of a70kg body on the surface of a planet whose mass is 1/7th that of Earth and radius is half of the earth?

Discussion

1469.	Why does PCl5 exist in solid state? What type of solid it is?
Answer» Why does PCl5 exist in solid state? What type of solid it is?

Discussion

1470.	A _________ is a group of stars that appear to form a recognisable shape.
Answer» A _________ is a group of stars that appear to form a recognisable shape.

Discussion

1471.	The fundamental frequency in an open organ pipeis equal to the third harmonic of a closed orpipe. If the length of the closed organ pipe is 920 cm, the length of the open organ pipe is
Answer» The fundamental frequency in an open organ pipeis equal to the third harmonic of a closed orpipe. If the length of the closed organ pipe is 920 cm, the length of the open organ pipe is

Discussion

1472.	57.Two planets of radii in the ratio 2:3 are made from the material of density in ratio 3:2 Then the ratio of acceleration due to gravity g1/g2 at the surface of the two planets will be
Answer» 57.Two planets of radii in the ratio 2:3 are made from the material of density in ratio 3:2 Then the ratio of acceleration due to gravity g1/g2 at the surface of the two planets will be

Discussion

1473.	Which of the quantity,velocity or acceleration determines the direction of motion ?
Answer» Which of the quantity,velocity or acceleration determines the direction of motion ?

Discussion

1474.	The electric bulb glows immediately as soon as the switch is on. what is the reason behind this?
Answer» The electric bulb glows immediately as soon as the switch is on. what is the reason behind this?

Discussion

1475.	The figure below shows a velocity-time graph of a train between two stations. Find the acceleration of the train in each of the time intervals OX, XY, and YZ respectively.
Answer» The figure below shows a velocity-time graph of a train between two stations. Find the acceleration of the train in each of the time intervals OX, XY, and YZ respectively.

Discussion

1476.	A point source of light ′S′ is placed on the principal axis of the concave mirror at a distance of 60 cm. At what distance from the concave mirror should a flat mirror be placed, for the rays to converge at the source after two successive reflections (first one from the concave mirror)?[Radius of curvature of concave mirror is 80 cm]
Answer» A point source of light $^{'} S^{'}$ is placed on the principal axis of the concave mirror at a distance of $60 cm$ . At what distance from the concave mirror should a flat mirror be placed, for the rays to converge at the source after two successive reflections $($ first one from the concave mirror $)$ ? $[$ Radius of curvature of concave mirror is $80 cm]$

Discussion

1477.	A stationary object is released from a point P at adistance 3R from the centre of the moon which hasradius R and mass M. Which of the following givesthe speed of the object on hitting the moon?
Answer» A stationary object is released from a point P at adistance 3R from the centre of the moon which hasradius R and mass M. Which of the following givesthe speed of the object on hitting the moon?

Discussion

1478.	A 8000kg engine pulls a train of 5 wagons, each of 2000kg along a horizontal track. If the engine exerts a force of 40000N and the track offers a friction force of 5000N. Then calculate 1)the net accelerating force; 2)the acceleration of the train ;and 3) the force of wagon 1on wagon 2.
Answer» A 8000kg engine pulls a train of 5 wagons, each of 2000kg along a horizontal track. If the engine exerts a force of 40000N and the track offers a friction force of 5000N. Then calculate 1)the net accelerating force; 2)the acceleration of the train ;and 3) the force of wagon 1on wagon 2.

1478.

A 8000kg engine pulls a train of 5 wagons, each of 2000kg along a horizontal track. If the engine exerts a force of 40000N and the track offers a friction force of 5000N. Then calculate 1)the net accelerating force; 2)the acceleration of the train ;and 3) the force of wagon 1on wagon 2.

Answer»

A 8000kg engine pulls a train of 5 wagons, each of 2000kg along a horizontal track. If the engine exerts a force of 40000N and the track offers a friction force of 5000N. Then calculate

1)the net accelerating force;

2)the acceleration of the train ;and

3) the force of wagon 1on wagon 2.

Discussion

1479.	A body of mass 5 kg is thrown vertically upwards so that it reaches a maximum height of 50 m in 20 seconds. Find the work done.
Answer» A body of mass 5 kg is thrown vertically upwards so that it reaches a maximum height of 50 m in 20 seconds. Find the work done.

Discussion

1480.	the acceleration of an object is given by a(t)=cos pi t m/s^2 and its velocity at time =0 is 1/2pi m/s at origin . Its distancell at t=3/2 s is
Answer» the acceleration of an object is given by a(t)=cos pi t m/s^2 and its velocity at time =0 is 1/2pi m/s at origin . Its distancell at t=3/2 s is

Discussion

1481.	Which of the following alphabets will show lateral inversion?
Answer» Which of the following alphabets will show lateral inversion?

Discussion

1482.	A Particle projected vertically upward passes the same height h at 2s and at 10s.If the acceleration due to gravity g=9.8 m/s^2, then what is the height?
Answer» A Particle projected vertically upward passes the same height h at 2s and at 10s.If the acceleration due to gravity g=9.8 m/s^2, then what is the height?

Discussion

1483.	if both the mass and the radius of earth decrease by 1% the value of escape velocity will decrease by nearly
Answer» if both the mass and the radius of earth decrease by 1% the value of escape velocity will decrease by nearly

Discussion

1484.	35. In myopic eye , when we stretch our eye muscles , why we can see far objects more clearer without spectacles?
Answer» 35. In myopic eye , when we stretch our eye muscles , why we can see far objects more clearer without spectacles?

Discussion

1485.	the density of a material in CGS system of units is 4g/cc^3.in a system of units in which unit of length is 10cm and unit of mass is 100g,the value of density of material will b
Answer» the density of a material in CGS system of units is 4g/cc^3.in a system of units in which unit of length is 10cm and unit of mass is 100g,the value of density of material will b

Discussion

1486.	23.Differential form of Boyle's law in terms of volume
Answer» 23.Differential form of Boyle's law in terms of volume

Discussion

1487.	32. Write the chemical equation for combustion of toluene
Answer» 32. Write the chemical equation for combustion of toluene

Discussion

1488.	The hour hand of a clock is 4 cm long. What is the distance and displacement that its tip would cover in 12 hours?
Answer» The hour hand of a clock is $4 cm$ long. What is the distance and displacement that its tip would cover in $12$ hours?

Discussion

1489.	Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why?Statement 1: The acceleration because of gravitational force is in the range of 10−12 ms−2.Statement 2: Stones are lying on a flat surface, so they cannot move.Statement 3: The force of friction is much higher than the gravitational force.Statement 4: The stones are irregular in shape, so they cannot move.Which statements explains the reason for the above question?
Answer» Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why? Statement 1: The acceleration because of gravitational force is in the range of $10^{- 12}$ $m s^{- 2}$ . Statement 2: Stones are lying on a flat surface, so they cannot move. Statement 3: The force of friction is much higher than the gravitational force. Statement 4: The stones are irregular in shape, so they cannot move. Which statements explains the reason for the above question?

1489.

Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why?Statement 1: The acceleration because of gravitational force is in the range of 10−12 ms−2.Statement 2: Stones are lying on a flat surface, so they cannot move.Statement 3: The force of friction is much higher than the gravitational force.Statement 4: The stones are irregular in shape, so they cannot move.Which statements explains the reason for the above question?

Answer»

Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why?

Statement 1: The acceleration because of gravitational force is in the range of $10^{- 12}$ $m s^{- 2}$ .

Statement 2: Stones are lying on a flat surface, so they cannot move.

Statement 3: The force of friction is much higher than the gravitational force.

Statement 4: The stones are irregular in shape, so they cannot move.

Which statements explains the reason for the above question?

Discussion

1490.	83.An equiconvex lens of refractive index 1.5 has power 4D in air . its power in water is ( R.I. of water = 4/3 )
Answer» 83.An equiconvex lens of refractive index 1.5 has power 4D in air . its power in water is ( R.I. of water = 4/3 )

Discussion

1491.	A ball is placed in a trough as shown. This can be categorised as
Answer» A ball is placed in a trough as shown. This can be categorised as

Discussion

1492.	Explain with the help of a formula the volumetric expansion coefficient of a solid.
Answer» Explain with the help of a formula the volumetric expansion coefficient of a solid.

Discussion

1493.	A 60 kg person climb the stairs of height 20m in 10 minutes. Calculate the power delivered.
Answer» A 60 kg person climb the stairs of height 20m in 10 minutes. Calculate the power delivered.

Discussion

1494.	Moment of inertia of a uniform rectangular lamina of sides l and 2l about larger edge is?
Answer» Moment of inertia of a uniform rectangular lamina of sides l and 2l about larger edge is?

Discussion

1495.	कविता को पढ़ते समय कुछ मुहावरे मानस-पटल पर उभर आते हैं, उन्हें लिखिए और अपने वाक्यों में प्रयुक्त कीजिए।
Answer» कविता को पढ़ते समय कुछ मुहावरे मानस-पटल पर उभर आते हैं, उन्हें लिखिए और अपने वाक्यों में प्रयुक्त कीजिए।

Discussion

1496.	The magnetic flux (ϕ) through a coil varies with time t as shown in the diagram. Which graph best represents the variation of the e.m.f E induced in the coil with time t ?
Answer» The magnetic flux $(ϕ)$ through a coil varies with time $t$ as shown in the diagram. Which graph best represents the variation of the e.m.f $E$ induced in the coil with time $t$ ?

Discussion

1497.	Two boys push a car of mass 1000 kg at a uniform velocity along a level road. The same car can be pushed by three boys to produce an acceleration of 0.5 ms−2.. With what force does the person push the car? ( The effort with which the boys pushed the car was the same)
Answer» Two boys push a car of mass 1000 kg at a uniform velocity along a level road. The same car can be pushed by three boys to produce an acceleration of 0.5 m $s^{- 2}$ .. With what force does the person push the car? ( The effort with which the boys pushed the car was the same)

Discussion

1498.	Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure. Jaikishan and Arun move in the given direction because of:
Answer» Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure. Jaikishan and Arun move in the given direction because of:

1498.

Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure. Jaikishan and Arun move in the given direction because of:

Answer»

Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure.

Jaikishan and Arun move in the given direction because of:

Discussion

1499.	If work is given by W=αβ2 e⎡⎢⎣−x2αkT⎤⎥⎦ where, k= Boltzmann constant, T = temperature, x is displacement, then the dimensional formula for β is
Answer» If work is given by $W = α β^{2} e^{⎡ ⎢ ⎣ \frac{- x^{2}}{α k T} ⎤ ⎥ ⎦}$ where, $k =$ Boltzmann constant, $T$ = temperature, $x$ is displacement, then the dimensional formula for $β$ is

Discussion

1500.	The wavelength of the upper limit of the audible sound in air, is .
Answer» The wavelength of the upper limit of the audible sound in air, is .

Discussion

Explore topic-wise InterviewSolutions in .

The value of acceleration due to gravity on the surface of the earth is 9.8m/s^2. Find the value on the surface of the moon.given that mass of the earth is 6×10^24 kg; radius of the earth is 6.4×10^6m;mass of the moon is 7.10^24kg;and the radius of the moon is 1.74×10^6m

Why work done against the gravity is negative? [2 MARKS]

Two balls are projected at different angles to acquire same horizontal range R with same initial speed u . If max height acquired by the balls are H1 and H2 resp, then (1)H1+H2=u2g (2)H1+H2= u22g (3)H1+H2=R24 (4) Both 2 and 3

Two electric bulbs one of 200V-40W and other of 200V-100W are connected in series to a 200 volt line, then

76.Two car drivers spot each other 80 m apart. They were travelling 72 km/h & 60 km/h respectively towards each other. Both simultaneously applies brakes , which retards both cars at the rate of 5 m/s (Metre per second sqaure). There will be collision or not?

1 newton = __ dyne.

A 1000kg vehicle moving with a speed of 20m/s is brought to rest in a distance of 50 meters: (i) Find the acceleration (ii) Calculate the unbalanced force acting on the vehicle.

A boy weighs 600 N on the Earth. What would be his weight on the moon?

Newtons second law

When astronauts go into space..there exist some gravitational force between them..so by Newton's first law of motion why the astronauts don't revolute around the earth like moon

The optical path of a monochromatic light is the same when it goes through 2.00 cm of glass or 2.25 cm of water. If the refractive index of water is 1.33. What is the refractive index of glass?

3 BLOCKS OF MASS 4KG,2KG AND 1 KG ARE PLACED SIDE BY SIDE ON A SMOOTH SURFACE. hORIZONTAL FORCE OF 14 N IS APPLIED ON 4 KG BLOCK THEN CONTACT FORCE BETWEEN 4 KG AND 2 KG BLOCK IS ?

momenrum p ,velocity v are related p=\surd a/b+\surd v then dimensuonak formukanof ab^{

64.How can mass changes with the change in the speed of a body

At what height the acceleration due to gravity will be reduced to 36% of its value on the surface of the earth?

When does a body float on a fluid?

What is the weight of a70kg body on the surface of a planet whose mass is 1/7th that of Earth and radius is half of the earth?

Why does PCl5 exist in solid state? What type of solid it is?

A _________ is a group of stars that appear to form a recognisable shape.

The fundamental frequency in an open organ pipeis equal to the third harmonic of a closed orpipe. If the length of the closed organ pipe is 920 cm, the length of the open organ pipe is

57.Two planets of radii in the ratio 2:3 are made from the material of density in ratio 3:2 Then the ratio of acceleration due to gravity g1/g2 at the surface of the two planets will be

Which of the quantity,velocity or acceleration determines the direction of motion ?

The electric bulb glows immediately as soon as the switch is on. what is the reason behind this?

The figure below shows a velocity-time graph of a train between two stations. Find the acceleration of the train in each of the time intervals OX, XY, and YZ respectively.

A stationary object is released from a point P at adistance 3R from the centre of the moon which hasradius R and mass M. Which of the following givesthe speed of the object on hitting the moon?

A 8000kg engine pulls a train of 5 wagons, each of 2000kg along a horizontal track. If the engine exerts a force of 40000N and the track offers a friction force of 5000N. Then calculate 1)the net accelerating force; 2)the acceleration of the train ;and 3) the force of wagon 1on wagon 2.

A body of mass 5 kg is thrown vertically upwards so that it reaches a maximum height of 50 m in 20 seconds. Find the work done.

the acceleration of an object is given by a(t)=cos pi t m/s^2 and its velocity at time =0 is 1/2pi m/s at origin . Its distancell at t=3/2 s is

Which of the following alphabets will show lateral inversion?

A Particle projected vertically upward passes the same height h at 2s and at 10s.If the acceleration due to gravity g=9.8 m/s^2, then what is the height?

if both the mass and the radius of earth decrease by 1% the value of escape velocity will decrease by nearly

35. In myopic eye , when we stretch our eye muscles , why we can see far objects more clearer without spectacles?

the density of a material in CGS system of units is 4g/cc^3.in a system of units in which unit of length is 10cm and unit of mass is 100g,the value of density of material will b

23.Differential form of Boyle's law in terms of volume

32. Write the chemical equation for combustion of toluene

The hour hand of a clock is 4 cm long. What is the distance and displacement that its tip would cover in 12 hours?

83.An equiconvex lens of refractive index 1.5 has power 4D in air . its power in water is ( R.I. of water = 4/3 )

A ball is placed in a trough as shown. This can be categorised as

Explain with the help of a formula the volumetric expansion coefficient of a solid.

A 60 kg person climb the stairs of height 20m in 10 minutes. Calculate the power delivered.

Moment of inertia of a uniform rectangular lamina of sides l and 2l about larger edge is?

कविता को पढ़ते समय कुछ मुहावरे मानस-पटल पर उभर आते हैं, उन्हें लिखिए और अपने वाक्यों में प्रयुक्त कीजिए।

The magnetic flux (ϕ) through a coil varies with time t as shown in the diagram. Which graph best represents the variation of the e.m.f E induced in the coil with time t ?

Two boys push a car of mass 1000 kg at a uniform velocity along a level road. The same car can be pushed by three boys to produce an acceleration of 0.5 ms−2.. With what force does the person push the car? ( The effort with which the boys pushed the car was the same)

Jaikishan and Arun are pushing each other as shown in the given figure. Jaikishan’s push is weaker than that of Arun. As a result, they move in the direction shown in the figure. Jaikishan and Arun move in the given direction because of:

If work is given by W=αβ2 e⎡⎢⎣−x2αkT⎤⎥⎦ where, k= Boltzmann constant, T = temperature, x is displacement, then the dimensional formula for β is

The wavelength of the upper limit of the audible sound in air, is .