TS EAMCET · Physics · Dual Nature of Matter
Radiations of wavelength \(400 \mathrm{~nm}\) incidents on a photo sensitive material of work function \(2.2 \mathrm{eV}\). The stopping potential is nearly
- A \(0.9 \mathrm{~V}\)
- B \(0.5 \mathrm{~V}\)
- C \(0.4 \mathrm{~V}\)
- D \(0.1 \mathrm{~V}\)
Answer & Solution
Correct Answer
(A) \(0.9 \mathrm{~V}\)
Step-by-step Solution
Detailed explanation
Work function, \(\mathrm{W}=2.2 \mathrm{ev}\) Energy of incident radiation, \(\mathrm{E}=\frac{1240}{400}=3.1 \mathrm{ev}\) \[ \begin{aligned} & E=W+K . E \\ & \text { ev }=E-W \\ & e v=3.1-2.2 \\ & v=0.9 v \end{aligned} \]
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