X-rays are most similar to which of the following--alpha, beta, or gamma?

I think gamma?

Gamma

Yes, you are correct. X-rays are most similar to gamma rays. Both X-rays and gamma rays are forms of electromagnetic radiation and have similar properties. They have a high frequency and a short wavelength. The main difference between them is their origin. X-rays are typically produced by accelerating electrons, while gamma rays are emitted by the nucleus of an atom during radioactive decay.

alpha and beta have mass

gamma and x do not