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(C) In a Coolidge tube,continuous $X$-rays are produced due to the deceleration of electrons as they strike the target,which occurs for any accelerati

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Both continuous and characteristic $K$-series $X$-rays

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(C) In a Coolidge tube,continuous $X$-rays are produced due to the deceleration of electrons as they strike the target,which occurs for any accelerating potential. For characteristic $K$-series $X$-rays to be produced,the incident electron must have sufficient energy to knock out an electron from the $K$-shell. The energy required to remove an electron from the $K$-shell is $40000 \,eV$. Since the applied accelerating potential is $60000 \,eV$,which is greater than the $K$-shell binding energy $(60000 \,eV > 40000 \,eV)$,the incident electrons have enough energy to ionize the $K$-shell. Therefore,both continuous $X$-rays (due to Bremsstrahlung) and characteristic $K$-series $X$-rays will be obtained.

If the energy of an electron in the $K$-shell is $40000 \,eV$ and an accelerating potential of $60000 \,eV$ is applied across a Coolidge tube,which of the following $X$-rays will be obtained?

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