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  4. Which of the following wavelength is not possible for an X-ray tube which is operated at 40 kV.

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Q. Which of the following wavelength is not possible for an X-ray tube which is operated at $40\, kV.$

Rajasthan PMTRajasthan PMT 2002

Solution:

Minimum wavelength of X-rays
$\lambda_{\min } =\frac{12375}{V} $
$=\frac{12375}{40000}=0.32 \,\mathring{A} $
Therefore, the wavelength $0.25 \,\mathring{A} $ is not possible because it is less than $0.32 \,\mathring{A} $