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

Alpha rays are

X-ray incident on a material

Alpha Rays

The X-ray spectrum of a metallic target has been shown in figure (a) What is the accelerating potential difference for bombarding electrons? (b) Two characteristic X-rays have been shown in the figure one of them is k_(alpha) X-ray and the other one is k_(beta) X-ray. What is wavelength of k_(alpha) X-ray? (c) Find the atomic number of the target atom.

The frquencies of K_alpha, K_beta and L_alpha X-rays of a materail are gamma_1, gamma_2 and gamma_3 respectively. Which of the following relation holds good?

When 50 keV electrons are made incident on a target material, the wavelength of K_(alpha) X–ray line was found to be 0.5Å. When the accelerating potential is increased to 100 kV, then the wavelength of K_(alpha) –line from the same target will be

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.