JEE Mains · Physics · STD 12 - 11. Dual nature of radiation and matter
In photoelectric experiment energy of \(2.48 \mathrm{eV}\) irradiates a photo sensitive material. The stopping potential was measured to be \(0.5 \mathrm{~V}\). Work function of the photo sensitive material is _______.
- A \(0.5 \mathrm{eV}\)
- B \(1.68 \mathrm{eV}\)
- C \(2.48 \mathrm{eV}\)
- D \(1.98 \mathrm{eV}\)
Answer & Solution
Correct Answer
(D) \(1.98 \mathrm{eV}\)
Step-by-step Solution
Detailed explanation
\(\mathrm{eV}=\mathrm{hv}-\phi\) \(0.5 \mathrm{~V}=2.48-\phi\) \(\text { work function }(\phi)=2.48 \mathrm{~V}-0.5 \mathrm{~V}=1.98 \mathrm{~V}\)
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