In order to generate the monochromatic radiation, what is voltage required to accelerate the electrons?

In order to generate the monochromatic radiation, what is voltage required to accelerate the electrons? Correct Answer >10kV

To generate the characteristic monochromatic radiation, the voltage used to accelerate the electrons need to be sufficiently high i.e. > or = 10kV so that ionization of the copper 1s electrons may occur.
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