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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 $E=h v$.
$B$. The velocity of a photon is $c$.
$C$. The momentum of a photon, $p=\frac{h v}{c}$.
$D$. 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:
$A, B, C$ and $D$ only
$A, C$ and $D$ only
$A, B, D$ and $E$ only
$A$ and $B$ only
Solution
($A$) If $c$ is the velocity of light
$E=h v$ (Energy of photon)
($B$) Velocity of photon is equal to velocity of light $i.e$. $c$.
($C$) $\lambda=\frac{h}{p}$
$p=\frac{h}{\lambda}$
$p=\frac{h v}{c}$
($D$) In photon-electron collision both total energy and total momentum are conserved.
