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JEE Mains · Physics · STD 12 - 11. Dual nature of radiation and matter
A monochromatic neon lamp with wavelength of \(670.5\, {nm}\) illuminates a photo-sensitive material which has a stopping voltage of \(0.48\, {V}\). What will be the stopping voltage if the source light is changed with another source of wavelength of \(474.6 \,{nm} ?\) (In \({V}\))
- A \(0.96\)
- B \(1.25\)
- C \(0.24\)
- D \(1.5\)
Answer & Solution
Correct Answer
(B) \(1.25\)
Step-by-step Solution
Detailed explanation
\({k} {E}_{\max }=\frac{{hc}}{\lambda_{{i}}}+\phi\) or \({eV}_{{o}}=\frac{{hc}}{\lambda_{{i}}}+\phi\) \(\text { when } \lambda_{{i}}=670.5\, {nm} ; \quad {V}_{0}=0.48\) \(\text { when } \lambda_{{i}}=474.6\, {nm} ; \quad {V}_{0}=?\) So,…
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