Question

Which statements best describe X-rays? Check all that apply.

X-rays are electromagnetic waves.
X-rays are longitudinal waves.
X-rays are mechanical waves.
X-rays are transverse waves.
X-rays travel at the speed of light.
X-rays travel at the speed of sound.

Answer 1

Select the true statements:

- X-rays are electromagnetic waves. — True.
- X-rays are transverse waves. — True. (Their electric and magnetic fields oscillate perpendicular to the direction of travel.)
- X-rays travel at the speed of light. — True in vacuum (in materials they travel somewhat slower).

The following are false:

- X-rays are longitudinal waves. — False.
- X-rays are mechanical waves. — False (they do not require a medium).
- X-rays travel at the speed of sound. — False.