Question
Can $\text{L}_\alpha$ X-ray of one material have shorter wavelength than $\text{K}_\alpha$ X-ray of another?
✓
Answer
An $\text{L}\alpha$ X-ray is emitted when an electron jumps from the M to the L shell, and a $\text{K}_\alpha$ X-ray is emitted when an electron jumps from the L to the K shell. Less energy is involved when an electron jumps from the M to the L shell than when it jumps from the L to the K shell. Also, wavelength of a photon is inversely related to its energy. Therefore, an $\text{L}\alpha$ X-ray has higher wavelength than a $\text{K}_\alpha$ X-ray for the same material.
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