Question

Choose the correct answer from the alternatives given.
X-rays, gamma rays and microwaves travelling in vacuum have

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

Answer 1

The correct option is C Same velocity but different wavelengths

All electromagnetic waves travel at the same speed.
As such,
$v=n\lambda$
Since $v$ is same frequency (n) and $\lambda$ will be different for the different electromagnetic waves.