mark the correct options.

Options

A. An atom with a vacancy has smaller energy than a neutral atom.
B. K X-ray is emitted when a hole makes a jump from the K shell to some other shell.
C. The wavelength of K X-ray is smaller than the wavelength of L X-ray of the same material.
D. The wavelength of `K_alpha` X-ray is smaller than the wavelength of `K_beta` X-ray of the same material.

Answer

B, C