| A beam of electrons striking a copper target produces x-rays. Its spectrum is as shown. Keeping the voltage same if the copper target is replaced with a different metal, the cut-off wavelength and characteristic lines of the new spectrum will change in comparison with old as - |
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A) Cut-off wavelength will remain unchanged while characteristic lines will be different.
B) Both cut-off wavelength and characteristic lines will remain unchanged.
C) Both cut-off wavelength and characteristic lines will be different.
D) Cut-off wavelength will different while characteristic lines will remain unchanged.
Correct Answer: A
Solution :
Cut-off wavelength of emitted X-rays depends on maximum kinetic energy of incident electrons on the target and is independent of nature of target. The characteristic lines depend on nature of material of target.
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