Question

Which of the following is a correct graph of Energy Vs Momentum of the photon?

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Energy of a photon is,
$E=pc$
Where $p=$ momentum, and $c=$ speed of light in vacuum.
$\therefore E=pc$, is similar to $y=mx$
Where, $E$ on y-axis and $p$ on x-axis.

And, slope is, $m=c=3\times {10}^8\text{m/s}$

Hence, $\left(C\right)$ is the correct answer.

$\begin{array}{c}\text{Why this question?}\\ \text{This question connects the knowledge about graphs \& energy of photons. Concept straight line equation}y=mx\text{passing through origin.}\end{array}$