Single Choice

If $$v_{g}, v_{x}$$, and $$v_{m}$$ are 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$$V_{g}=V_{x}=V_{m}$$
Correct Answer

Solution

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. So, option $$(D)$$ is correct.

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