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Q. Minimum wavelength of X-rays produced in a coolidge tube operated at potential difference of $40 \,kV$ is

Rajasthan PMTRajasthan PMT 2003

Solution:

For continuous X-rays, minimum wavelength produced,
$\lambda_{\min } =\frac{h c}{e V} $
$=\frac{12375}{(\text { Energy in } eV )} \,\mathring{A} $
$=\frac{12375}{40 \times 10^{3}} \,\mathring{A}=0.31 \,\mathring{A}$