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In a coolidge tube, the tungsten (Z=74) ...

In a coolidge tube, the tungsten (Z=74) target is bombarded by electrons. What is the minimum value of the accelerating potential to enable emission of characteristic `K_(alpha)` and `K_(beta)` lines of tungsten. ( The K,L & M levels of tungsten have Binding energies of 69.5, 11.3 & 2.30 keV respectively.)

A

2.3keV

B

1.3keV

C

69.5keV

D

72 keV

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