The rest mass of photon is:
Correct answer: B. Zero
- A. Infinite
- B. Zero
- C. 1.6 x 10^-27 kg
- D. 3 x 10^8 kg
Explanation
The rest mass of a photon is 0. This is because photons are particles of light and they always move at the speed of light in a vacuum. According to the theory of relativity, any particle that moves at the speed of light must have zero rest mass. Therefore, the rest mass of a photon is 0.m0 =0where (m0) is the rest mass of the photon.
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About Photons and the Particle Model of Light
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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