JEE Mains · Chemistry · STD 11 - 2. structure of atom
Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying \(0.5\,V\) when the radiation of \(250\, nm\) is used. The work function of the metal is ................ \(\mathrm{eV}\)
- A \(4\)
- B \(5.5\)
- C \(4.5\)
- D \(5\)
Answer & Solution
Correct Answer
(C) \(4.5\)
Step-by-step Solution
Detailed explanation
\(\lambda = 250\,nm = 2500\,\mathop A\limits^o \) \(E = \frac{{hc}}{\lambda } = \frac{{12400}}{{2500}} = 4.96\,eV\) \(KE = \) stopping potential \( = 0.5\,eV\) \(E = {W_0} + K.E.\) \(4.96 = {W_0} + 0.5\) \({W_0} = 4.46 \approx 4.5\,eV\)
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