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An X-ray tube operates at an accelerating potential of 20 kV. Which of the following wavelengths will be absent in the continuous spectrum of X-rays?

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12 pm

75 pm

65 pm

95 pm

answer is A.

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Detailed Solution

As, we know, $λ_{\min} (in \overset{0}{A}) = \frac{12375}{V} = \frac{12375}{20000} \overset{0}{A} = 61.87 pm$

Since, $λ$ should be greater than $λ$ _min.

Hence, $λ$ = 12 pm is absent in spectrum.

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