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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2019

PhysicsEasysingle choice

Assertion : A photon has no rest mass, yet it carries definite momentum. Reason : Momentum of photon is due to its energy and hence its equivalent mass.

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Solution:

Equivalent mass of photon $(m)$ is given from equation $E = m c^{2} = h v ∴ m = \frac{h v}{c ^{2}}$ where $E$ is energy, $m$ is mass, $c$ is speed of light, $h$ is Planck's constant, $v$ is frequency. $∴$ Momentum of photon $= \frac{h v}{c ^{2}} \times c = \frac{h v}{c}$

Stream:AIIMSSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2019

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