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Question

An X-ray tube is operated at 66 kV. Then, in the continuous spectrum of the emitted X-rays


A
wavelengths 0.01 nm and 0.02 nm will both be present
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B
wavelengths 0.01 nm and 0.02 nm will both be absent
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C
wavelength 0.02 nm will be absent but wavelength 0.01 nm will be present
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D
wavelength 0.01 nm will be absent but wavelength 0.02 nm will be present
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Solution

The correct option is D wavelength 0.01 nm will be absent but wavelength 0.02 nm will be present

Here, V=66 kV=66000 V
Now, λmin=hceV=6.6×1034×3×1081.6×1019×66,000=1.87×1011 m=0.0187 nm
Since wavelength 0.01 nm is less than λmin, it will be absent from the continuous spectrum.
Hence, the correct choice is (d).


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