Question

which of the following is not property of the photons (a) momentum , (b) energy, (c) frequency, (d) rest mass

Answer 1

d ) rest mass
because photons are generally in excited state

Answer 2

(d) rest mass is not the property of the photons.

(d) rest mass:

Photons always travel at the same rate. A photon has zero rest mass and carries energy proportionate to the radiation frequency.

Explanation for incorrect answer:

(a) momentum:

A photon's momentum is proportional to its wavelength, whereas its energy is proportional to its frequency. So this is the wrong answer.

(b) energy:

The quantity of energy in a photon is directly proportional to its electromagnetic frequency, and consequently inversely proportional to its wavelength. So this is the wrong answer.

(c) frequency:

The wavelength of a photon is inversely related to its frequency, which is another way of expressing the photon's energy. So this is the wrong answer.

As a result, rest mass is not a feature of photons.

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