Light travels in the form of photons. Identify the correct statements.
(A) Photons travel with the velocity of light in vacuum.
(B) The rest mass of photons is taken as zero.
(C) Photons have energy which depends on frequency.
(D) Photons have a momentum inversely dependent on frequency.
Choose the correct answer from the options given below.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A), (B) and (C) only
(A) True — Photons always travel with the velocity of light (c) in vacuum.
(B) True — The rest mass of a photon is zero.
(C) True — Photon energy is given by $E = h\nu$, hence depends on frequency.
(D) False — Photon momentum is $p = \frac{E}{c} = \frac{h\nu}{c}$, which is directly proportional to frequency, not inversely.