To increase the hardness of X-rays in coolidge tube we should :-

increase filament current

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increase filament voltage

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increase the voltage applied between cathode and anticathode

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none of these

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Solution

The correct option is C
increase the voltage applied between cathode and anticathode

We know that,
To increase the hardness of X-rays in coolidge tube we should increase the voltage applied between cathode and anticathode.
Hence option C is correct.

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