Question

If $v_{g}, v_{x}$ and $v_{m}$ are the speeds of gamma rays, X-rays and microwaves respectively in vacuum then

• A. $v_{g}>v_{x}>v_{m}$
• B. $v_{g} < v_{x} < v_{m}$
• C. $v_{g} > v_{x} < v_{m}$
• D. $v_{g}=v_{x}=v_{m}$

Answer 1

Answer: (D)

The gamma rays, $X$ - rays and the microwaves are the Electromagnetic waves and the speed of all the electromagnetic waves remains the same in vacuum irrespective of other parameters. All will travel at the speed of light.
$V _{ g }= V _{ x }= V _{ m }$
The speed of Electromagnetic waves is always the same in vacuum.