Given below are two statements: one is labell | vedclass

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(B) The minimum energy required to eject an electron from a metal surface is called the work function $(W_0)$.If the energy of incident radiation $(h\

Vedclass · Accepted Answer

Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$.

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(B) The minimum energy required to eject an electron from a metal surface is called the work function $(W_0)$.If the energy of incident radiation $(h
u)$ is less than the work function $(W_0)$,the photons do not have sufficient energy to overcome the surface barrier,so the photoelectric effect does not occur. Thus,Assertion $A$ is correct.According to Einstein's photoelectric equation: $h
u = W_0 + K.E._{\max}$.If the incident energy $h
u = W_0$,then $K.E._{\max} = h
u - W_0 = 0$. Thus,Reason $R$ is correct.However,Reason $R$ explains the condition for zero kinetic energy,but it does not explain why the photoelectric effect fails to occur when $h
u < W_0$. Therefore,$R$ is not the correct explanation of $A$.

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