Question

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

• A. Same wavelength but different velocities
• B. Same frequency but different velocities
• C. Same velocity but different wavelengths
• D. Same velocity and same frequency

Answer 1

Answer: (C)

Same velocity but different wavelengths

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.

Option $\left(C\right)$ is correct.