When a beam of accelerated electrons hits a target, continuous X-ra...

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When a beam of accelerated electrons hits a target, continuous X-ray spectrum is emitted from the target. Which
\( \mathrm{P} \) one of the following wavelength is absent in the X-ray spectrum

W if the X-rays tube is operated at \( 40,000 \mathrm{~V} \) ?
(A) \( 1.5 \AA \)
(B) \( 0.5 \AA \)
(C) \( 0.25 \AA \)
(D) \( 1.0 \AA \)
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