Question
If $c$ is the velocity of light in free space, the correct statements about photon among the following are:
A. The energy of a photon is $E = hv$.
B. The velocity of a photon is c.
C. The momentum of a photon, $p = \frac{hv}{c}$.
D. In a photon-electron collision, both total energy and total momentum are conserved.
E. Photon possesses positive charge.
Choose the correct answer from the options given below:
Options
Solution
Sol. [Key Concept: Speed of light c and properties of EM waves] [A] If $c$ is the velocity of light
$$\text{~}\text{so,}\text{~}E = h\nu\text{~}\text{(Energy of photon)}\text{~}$$
[B] Velocity of photon is equal to velocity of light i.e. c.
[C] $\lambda = \frac{h}{p}$
$$\begin{matrix} & p = \frac{h}{\lambda} \\ & p = \frac{hv}{c} \end{matrix}$$
[D] In photon-electron collision both total energy and total momentum are conserved.
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