The wavelength of L-alpha characteristic X-Ray is :

Directly proportional to Ek-El

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Inversely proportional to El-Em

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Directly proportional to El-Ek

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Directly proportional to El-Em

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Solution

The correct option is B
Inversely proportional to El-Em

$L_{α}$ characteristic x-ray gets emitted when an electron from M-shell jumps to fill the vacancy created in L-shell.

The energy difference thus is, $E_{L} - E_{M},$ this is the energy of the mentioned x-ray. And since wavelength is inversely proportional to the energy, we have our answer.

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