The energy of a tungsten atom with a vacancy in L shell is 11.3 keV. Wavelength of K α photon for tungsten is 21.3 pm. If a potential difference of 62 kV is applied across the x-rays tube following

Question

The energy of a tungsten atom with a vacancy in L shell is 11.3 keV. Wavelength of K α ​ photon for tungsten is 21.3 pm. If a potential difference of 62 kV is applied across the x-rays tube following characteristic x-rays will be produced.

TestHub · Accepted Answer

E K α ​ = 0.0213 nm 1240 eV nm ​ ≈ 58.2 keV . K-shell binding = 58.2 + 11.3 = 69.5 keV > 62 keV , so K-series is not excited. L-shell binding = 11.3 keV < 62 keV, so only L series is produced.

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