If the frequency of an emitted x-ray is 1.6 x 1016Hz, the accelerating potential is?…

If the frequency of an emitted x-ray is 1.6 x 1016Hz, the accelerating potential is?
[e = 1.6 x 10-19C, h = 6.63 x 10-34Js]
  • A.
    6630.0V
  • B.
    663.0V
  • C.
    66.3V
  • D.
    6.6V
Correct Answer: Option C
Explanation

Energy imparted by the accelerating system = e x V, where V is the accelerating potential; and this energy is equal to the energy of the X-ray, give by hf
e x V = hf
∴ V = hf/e
(6.63 x 10-34 x 1.6 x 10-16)/1.6 x 10-19
= 6.63 x 10 = 66.3V

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