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For production of characteristic $K_{β}$ X-rays, the electron transition is

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n = 4 to n = 2

n = 3 to n = 2

n = 2 to n = 1

n = 3 to n = 1

answer is C.

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Detailed Solution

If an electron is knocked out from k th orbit then an electron existing in 3 orbit will fill the vacancy to emit $K_{β}$ PHOTON.

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