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Physics Question on Electromagnetic waves

X-rays, gamma rays and microwaves travelling in vacuum have

A

same velocity and same frequency

B

same wavelengths but different velocities

C

same frequency but different velocities

D

same velocity but different wavelengths

Answer

same velocity but different wavelengths

Explanation

Solution

In a vacuum, all light travels the same speed irrespective of the wavelength or frequency of the wave. Gamma radiation has a smaller wavelength and larger frequency, radio waves a smaller frequency and larger wavelength.
So, x-rays, gamma rays and microwaves traveling in vacuum have the same velocity but different wavelengths.