Question

X-rays are more harmful to human beings than ultraviolet radiations because X-rays ______.

Options

• have frequency lower than that of ultraviolet radiations.

• have wavelength smaller than that of ultraviolet radiations.

• move faster than ultraviolet radiations in air.

• are mechanical waves but ultraviolet radiations are electro-magnetic waves.

Answer 1

X-rays are more harmful to human beings than ultraviolet radiations because X-rays have wavelength smaller than that of ultraviolet radiations.

Explanation:

X-rays have much shorter wavelengths and higher energies than UV rays.