1.

The \[{{K}_{\alpha }}\]X-ray emission line of tungsten occurs at \[\lambda =0.021\]\[nm\]. The energy difference between K and L levels in this atom is about                                                        [IIT 1997 Cancelled]

A.            0.51MeV
B.            1.2 MeV
C.            59 KeV                                    
D.            13.6 eV
Answer» D.            13.6 eV


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