Can `L_alpha` X-ray of one material have shorter wavelength than `K_alpha` X-ray of another?

X-ray incident on a material

Show that the frequency of K_beta X-ray of a material equals the sum of the frequencies of K_alpha and L_alpha X-rays of the same material.

The wavelength of X-rays is in the order of

For a given material, the energy and wavelength of characterstic X-rays satisfy

Use Moseley's law with b = 1 to find the frequency of the K_alpha X-ray of La(Z = 57) if the frequency of the K_alpha X-ray of Cu(Z = 29) is known to be 1*88 xx 10^(18) Hz.

Iron emits K_alpha X-ray of energy 6.4 keV and Calcium emits K_alpha X-ray of energy 3.69 keV. Calculate the times taken by an iron K_a photon and a calcium K_a photon to cross through a distance of 3 km.

Can X-rays be polarized?

The wavelength of K_alpha and L_alpha X-rays of a material are 21.3 pm and 141 pm respectively. Find the wavelength of K_beta X-ray of the material.

The k_alpha X-rays of aluminium (Z = 13 ) and zinc ( Z = 30) have wavelengths 887 pm and 146 pm respectively. Use Moseley\'s law sqrt v = a(Z - b) to find the wavelength of the K_alpha X-ray of iron (Z = 26).