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An X-ray tube operates at 20 kV. A particular electron loses 5% of its orbit kinetic energy to emit an X-ray photon at the first collision wavelength corresponding to this photon is:

Option: 1

1.24nm


Option: 2

2.48nm


Option: 3

3.72nm


Option: 4

4.96nm


Answers (1)

best_answer

As electrons are subjected to a potential 20 kV,

Kinetic energy acquired by an electron is     K=q \Delta V=e(20\times 10^{3}V)=20\times10^3 eV

Energy of photon of X-ray is 5% of the kinetic energy of an electron  = 0.05 x 20KeV = 1 KeV

\lambda =\frac{E}{hc}=1.24nm

 

Posted by

jitender.kumar

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