Q.

An X-ray tube with a copper target emits CuKα line of wavelength 1.50 Ao. What should be the minimum voltage through which electrons are to be accelerated to produce this wavelength of X rays? h=6.63×10−34J−sec,c=3×108m/s

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a

8280 V

b

828 V

c

82800 V

d

8.28 V

answer is A.

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Detailed Solution

eV=hcλ=6.63×10−34×3×1081.5×10−10⇒V=6.63×10−34×3×1081.5×10−108280 Volt.
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An X-ray tube with a copper target emits CuKα line of wavelength 1.50 Ao. What should be the minimum voltage through which electrons are to be accelerated to produce this wavelength of X rays? h=6.63×10−34J−sec,c=3×108m/s