Rest mass of a photon is________________?
Correct answer: B. zero
- A. infinite
- B. zero
- C. very small
- D. 1.67 x 10^-27 kg
Explanation
A photon has zero invariant or rest mass, although it carries energy E = hf and momentum p = E/c. Rest mass is the mass measured in a particle's own rest frame, and a photon has no rest frame because it travels at light speed. Students may choose c by confusing its nonzero energy with nonzero rest mass.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Dawn of Modern Physics
739 free Dawn of Modern Physics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Photons and the Particle Model of Light questions
Einstein's photoelectric equation is given by_______________?
In Compton scattering, the change in wavelength is maxed if_______________?
A photon is________________?
Stopping potential for a metal surface in case of photoelectric emission depends on_____________?
Which one of the following radiations has the strongest photon?
Pair production cannot take place in a vacuum as ________________?