Question

Choose the correct answer from the alternatives given.
If $v_g,v_X$ and $v_m$ are the speeds of gamma rays, X-rays and microwaves respectively in vacuum, then

• A. $V_g<V_X<Vm$
• B. $V_g>V_X>Vm$
• C. $V_g>V_X<Vm$
• D. $V_g=V_X=Vm$

Answer 1

Answer: (D)

$V_g=V_X=Vm$

The gamma rays, X-rays and microwaves are the electromagnetic waves and the speed of all electromagnetic waves is the same in vacuum. The electromagnetic waves travel at the speed of light.

So, $V_g=V_X=V_m$ i.e. option $\left(D\right)$ is correct.