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(D) In $K-$electron capture,the nucleus of an atom captures an electron from the innermost $K-$shell. This creates a vacancy in the $K-$shell. An elec

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$K-$electron capture

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(D) In $K-$electron capture,the nucleus of an atom captures an electron from the innermost $K-$shell. This creates a vacancy in the $K-$shell. An electron from a higher energy shell (like the $L$ or $M$ shell) then transitions to fill this vacancy. As the electron drops to a lower energy state,the energy difference is released in the form of a characteristic $X-$ray photon.

Which of the following is accompanied by the characteristic $X-$ray emission?

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