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Bulk modulus is the ratio of pressure and volumetric strain .e.g., Bulk modulus , B = pressure/volumetric strain

∵ volumetric strain = change in volume /original volume if change in volume is ∆VAnd original volume is V Then , volumetric strian = ∆V/V

Now, B = P/∆V/V [ I didn't mention negative sign , because I just want to relation between given terms ] ∴ B 1/{∆V/V} ∴ ∆V/V 1/B

1.In Physics,workisdonewhen the object moves through a certain distance in a particular direction after the force had been applied on it. Forwork to be done, the force must be applied and must not be zero.

2.There is a strong connectionbetween work and energy, in a sense that when there is a net force doingworkon an object, the object's kineticenergywill change by an amount equal to theworkdone: Note that theworkin this equation is theworkdone by the net force, rather than theworkdone by an individual force

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(i)The circuit operates on Faraday'sprincipalof “mutual induction”, in which an EMF is induced in thecoil B by the magnetic flux generated by the voltages and currents flowing in the coil A.

(ii)It depends on the following factors:-

- ratio of number of turns in coil A and coil B.-voltage applied to coil A.

friction depends on the nature of surface

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Aspeedometeror a speed meter is a gauge that measures and displays the instantaneous speed of a vehicle.

Definition:Transformer is a static device which convert electrical power from one circuit to another without changing its frequency. it Step up (or Step down) the level of AC Voltage and Current.

Working principle:it works on the principle of mutual induction of two coils or Faraday Law’s Of Electromagnetic induction. When current in the primary coil is changed the flux linked to the secondary coil also changes.hence an EMF is induced in the secondary coil due to Faraday law’s of electromagnetic induction.

The transformer is based on two principles: first, that an electric current can produce a magnetic field (electromagnetism), and, second that a changing magnetic field within a coil of wire induces a voltage across the ends of the coil . Changing the current in the primary coil changes the magnetic flux that is developed. The changing magnetic flux induces a voltage in the secondary coil.

Electric current passes through the wheel from the axle to a mercury contact on the rim.

The interaction of the current with the magnetic field of a U-magnet laid flat on the baseplate causes the wheel to rotate.

working principalCyclotron is a device to acceleratecharged particlesto very high speed. It employs an electric and magnetic field for the same purpose. The working of a cyclotron is based on the fact that the frequency of revolution ofcharged particleis not dependent on the energy

High frequency oscillator maintains moderate alternating potential difference between the dees. This potential difference establishes an electric field that reverse its direction periodically. Suppose a positive ion of moderate mass produced at the centre of the dees, finds D2at negative potential. It gets accelerated towards it. A uniform magnetic field, normal to the plane of the dees, makes it move in a circular track. Particle t races a semicircular track and returns back to the region between the dees. The moment it arrives in the region electric field reverses its direction and accelerate the charge towards. D1. This way charge keeps on getting accelerated until it is removed out of the dees.Centripetal force, neede d by the charged particle to move in circular track, is provided by the magnetic field.

Thus, frequency of revolut/ion is independent of the energy of the particle. Yes, there is an upper limit on the energy acquired by the charged particle. The charged part icle gains maximum speed when it moves in a path of radius equal to the radius of the dees

Working-When a current is allowed to flow through the coil PQRS the coil starts rotating anti-clockwise. This happens because a downward force acts on length PQ and at the same time, an upward force acts on length RS. As a result, the coil rotates anti-clockwise.Current in the length PQ flows from P to Q and the magnetic field acts from left to right, normal to length PQ. Therefore, according to Fleming’s left hand rule, a downward force acts on the length PQ. Similarly at an upward force acts on the length RS. These two forces cause the coil to rotate anti-clockwise.When coil complete half rotation, the position of PQ and RS interchange. The half-ring D comes in contact with brush A and half-ring C comes in contact with brush B. therefore the direction of current in the coil PQRS gets reversed. Now the current flows through the coil in the direction SRQP.

An electric motor is a device which converts electrical energy into mechanical energy. The principle behind the electric motor is based on Fleming’s left hand rule.

The

direction of current through the coil PQRS reverse after every half rotation. As a result, the coil rotates in same direction. The split rings help to reverse the direction of current in the circuit. These are called the commutator.

tq

By using the Basic formula i.e I = MR^2Where M = 4Kg , R = 1mI = 4 x 1 ^2 = 4Kgm^2

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The cause of dispersion is the change in speed of light with wavelength .when white light enters the first surface of a Prism ,light of different colours due to their different speeds in glasses gets deviated towards the base of the prism through different angles that is the Dispersion of white light into its constituent colours takes place at the first surface of prism.

Newton's experiment -Newton allowed white light from the sun to enter a dark room with through a small aperture in a window and placed a glass prism in the path of white light .the light coming out of the prism was received on a white screen .on the screen a coloured patch like a rainbow was found which was termed as spectrum .starting from the side of the base of the prism the colours of the spectrum on the screen in the following order violet Indigo blue green yellow orange and red the order of colouring

Consider the same body being lifted in the upward direction. In this case, the force ofgravityis acting in the downward direction. But, the displacement of the body is in the upward direction. Since the angle between the force and displacement is 180o, thework doneby thegravitationalforce on the body isnegative.

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Total frictional force acting on the block is 𝛍mgcosx =mg𝛍cosx=4*10*0.2*4/5=32/5=6.4NSo work done by frictional force = F*D =6.4*3 =19.2J

Let us consider that the whole chain is initially hanging from the edge of the table. Then, the centre of mass is at a height of L/2 from the edge of the table.Now when, the whole chain is pulled back on the table the centre of mass rises a height L/2.

Now the work done = increase in the potential energy of centre of mass = m×​ g×​ L/2Therefore,W= mgL/2

Here work done is zero since the displacement of the man is equals to zero

Here work done is zero

how we get Vb as root3

no work is done becoz if we change any matter's state then only it is considered that a work is done

no work is done by the man because the wall is fixed, and if we give exerts a force on the wall it will also exert an equal force on us

Since P deviates less, it moves slower by definition of refractive index, and Q moves faster.

An electric charge occurs when the atoms of matter contain unequal numbers of electrons and protons. Protons are positively charged and electrons are negatively charged.

Angle of the prism is the correct answer

Refractionof Light. Light does not travel in the same direction in all media. It appears that when travelling obliquely from one medium to another, the direction of propagation of light in the second medium changes.

Reflection of lightis the phenomenon of bouncing back oflightin the same medium on striking the surface of any object. • The two laws ofreflectionare: (i) the incident ray, thereflectedray and the normal (at the point of incidence), all lie in the same plane.

Power of a lens= 1/ focal length

The diopter is the unit of measure for the refractivepower of a lens. Thepower of a lensis defined as the reciprocal of its focal length in meters, or D = 1/f, where D is thepowerin diopters and f is the focal length in meters.Lenssurfacepowercan be found with the index of refraction and radius of curvature

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Thelaw of reflectionstates that the incident ray, thereflectedray, and the normal to the surface of the mirror all lie in the same plane. Furthermore, the angle ofreflectionis equal to the angle of incidence .please like the solution 👍 ✔️

Ans :- In physics refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium. Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction.

It is the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.

in hindi mein

prakash ki se kehte hain

In physicsrefractionis the change in direction of a wave passing from one medium to another or from a gradual change in the medium.Refractionof light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experiencerefraction.

the bending of light when traveling from one medium to another medium is known as refraction.it occurs due to change in spped of light

the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.

change in direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.

measurement of the focusing characteristics of an eye or eyes.

Refraction is the bending of the light wave when it passes from one medium into another medium.

(a) zero because both point lie on equipotential surface(b) 30×(6-4) =60V

no that is reflection. I mean refraction

Refraction is the phenomenon of change of direction of wave due to change of its transmission medium.Laws of refraction:1) Snell's law:ratio of sine of angle of incidence to the angle of refraction is always constant for two given media.2) incident Ray , refracted Ray and normal Ray all like on the same plane.

okk

In physics refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium. Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction.

By default, Microsoft Office Excel providesthreeworksheets in a workbook.

your answer is 8/3 its solve by wheet stone bridge

Ernest Rutherford invented the proton.

This is the temperature at which that substance exists in its solid, liquid and gaseous state all at the same time. The triple point of water is the most important fixed point on ITS-90 as it is the sole fixed point which is common to ITS-90 and the Kelvin Thermodynamic Temperature Scale.

Sperm cells cannot divide and have a limited life span, but after fusion with egg cells during fertilization, a new organism begins developing, starting as a totipotent zygote. The human sperm cell ishaploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell.

Theprocessofnuclearfission of radioactive material iscurrently used in nuclear power generatorto produceElectricity.

Nuclear fission of uranium atom will release heatenergywhich isusedto vapourise water and this steam created isusedto rotate turbines thereby producingpower.

Ans :- The process of splitting a nucleus is called nuclear fission.Uraniumorplutonium isotopes are normally used as the fuel in nuclear reactors because their nuclei are relatively large and easy to split. For fission to happen, theuranium-235orplutonium-239nucleus must first absorb a neutron.

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l/t1 = speed of man = s1l/t2 = speed of escalator = s2Now, the relative speed = s1 + s2 = l(t1 + t2) /(t1*t2) Time taken = l/(s2+s1) = t1*t2/(t1+t2) option A