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A beam of electrons striking a copper ta...

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 new spectrum will change in comparison with odd as

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 be different while characteristic lines will remain unchanged.

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