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Question

If the incident electrons in Coolidge tube are accelerated through a potential of V volt, then the maximum frequency of continuous X-rays will be
  1. V
  2. hV
  3. eVh
  4. heV

A
V
B
hV
C
heV
D
eVh
Solution
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Energy gained by an electron by being accelerated by a voltage V:
E=eV
This energy is completely used to generate X-rays.
Energy of radiation is given by:
E=hν
Comparing the two, we get:
ν=eVh

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