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In an X- ray tube , electrons accelerate...

In an X- ray tube , electrons accelerated through a potential difference of `15000` volts strike a copper target . The speed of the emitted X - ray inside the tube is …….. `m//s`

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The correct Answer is:
c
The speed of X-rays is always `3 xx 10^(8) m s^(-1)` in vacuum. It does not depend on the potential difference through which electrons are accelerated in an X-ray tube.
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