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Q.

With a D.C. power supply giving 10 mA at a potential difference of 50 kV. The power of the emitted X – ray is 5 watt. The efficiency of X - ray tube is

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a

10 %

b

1 %

c

5 %

d

25 %

answer is B.

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Detailed Solution

input power gives 50 kV x10 mA = 500 watt. output X ray has the power 5 W . So efficiency is 5500×100=1%
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With a D.C. power supply giving 10 mA at a potential difference of 50 kV. The power of the emitted X – ray is 5 watt. The efficiency of X - ray tube is