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JEE Mains · Physics · STD 12 - 11. Dual nature of radiation and matter
In a photoelectric experiment, the wavelength of the light incident on a metal is changed from \(300\, nm\) to \(400\, nm\). The decrease in the stopping potential is close to ................ \(V\) \(\left( {\frac {{hc}}{e} = 1240\,nm - V} \right)\)
- A \(0.5\)
- B \(1.5\)
- C \(1\)
- D \(2\)
Answer & Solution
Correct Answer
(C) \(1\)
Step-by-step Solution
Detailed explanation
\(\frac{\mathrm{hc}}{\lambda_{1}}=\phi+\mathrm{eV}_{1}\) ...... \((i)\) \(\frac{\mathrm{hc}}{\lambda_{2}}=\phi+\mathrm{eV}_{2}\) ...... \((ii)\) \((i)\) \(-\) \((ii)\) \(\operatorname{hc}\left(\frac{1}{\lambda_{1}}-\frac{1}{\lambda_{2}}\right)=e\left(V_{1}-V_{2}\right)\)…
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