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  4. Einstein's photoelectric equation states that Ek=hν-W . In this equation, Ek refers to

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Q. Einstein's photoelectric equation states that $E_{k}=h\nu-W$ . In this equation, $E_{k}$ refers to

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Solution:

$E_{k}$ refers to maximum kinetic energy of emitted electrons. The energy of photon absorbed is used in doing work against forces of attraction and imparting kinetic energy to electron.