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Characteristic Spectrum

The K ∝ X - r...

Question

The $K_{\propto}$ X - ray emission line of tungsten occurs at $λ$ = 0.021nm. The energy difference between K and L levels in this atom is about

A

0.51 MeV

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B

1.2 MeV

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C

59 keV

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D

136 eV

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Solution

The correct option is C 59 keV
Energy difference, $E_{K} - E_{L} = \frac{h c}{λ} = \frac{1241.5 e V . n m}{0.021 n m} = 59 k e V$

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