Q.

The energy of a photon of characteristic X-rays from a Coolidge tube comes from

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a

The kinetic energy of the striking electron

b

The kinetic energy of the free electrons of the target

c

The kinetic energy of the ions of the target

d

An electronic transition of the target atom

answer is D.

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Detailed Solution

The energy of X-ray photon obtained from a Coolidge tube by an electronic transition of target atom such as Kα line is obtained from transition from L orbit in K orbit.
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