Question

Which of the following is true for X-rays?

Options

• the wavelength of continuous X-rays does not depend on potential difference.

• the wavelength of discrete X-rays does not depend on potential difference.

• discrete X-rays have the energy of the order of MeV.

• continuous X-rays have the energy of the order of MeV.

Answer 1

the wavelength of discrete X-rays does not depend on potential difference.

Explanation:

Continuous X-rays are created by the slowing of electrons, the K.E. of which is determined by the potential difference. Discrete X-rays are generated when an electron transitions between energy levels with fixed values that do not rely on potential difference.