Question

Use the usual meanings of the symbols to match the following

Answer 1

We can only tell about $K{E}_{max}$, not average KE of emitted electrons.
Min KE of electrons will be zero( electrons do not get emitted in this case).
Min wavelength of continuous X-rays, $h{\nu }_{max}=\frac{hc}{{\lambda }_{min}}=eV$
$\Rightarrow {\lambda }_{min}=\frac{hc}{eV}$