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The K(alpha) X-ray emission line of tung...

The `K_(alpha)` X-ray emission line of tungsten occurs at `lambda = 0.02 nm`. The energy difference between `K and L` level in this atom is about

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`Delta E = (hc)/(lambda) = (6.62 xx 10^(-34) xx 3 xx 10^(8))/(0.021 xx 10^(-9))`
`= 9.46 xx 10^(-15)J = 5.9 xx 10^(4) e V = 59 ke V`
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