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Einstein's photoelectric equation states that ${\mathrm{E}}_{\mathrm{k}}=\mathrm{hv}-\mathrm{\varphi }$. In this equation ${\mathrm{E}}_{\mathrm{k}}$ refers to
(a) Kinetic energy of all the emitted electrons
(b) Mean kinetic energy of the emitted electrons
(c) Maximum kinetic energy of the emitted electrons
(d) Minimum kinetic energy of the emitted electrons