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  • Silver has a work function of 4.7eV. when uv light of wavelength 100 nm is incident upon it, a potential of 7.7 V is required to stop the photoelectrons from reaching the collector plate.

Silver has a work function of 4.7eV. when uv light of wavelength 100 nm is incident upon it, a potential of 7.7 V is required to stop the photoelectrons from reaching the collector plate. How much potential will be required to: stop the photoelectrons when light of wavelength 200 nm is incident upon silver.

Option: 1

1.5 V


Option: 2

3.85 V


Option: 3

2.35 V


Option: 4

15.4 V


Answers (1)

best_answer

\mathrm{\begin{aligned} & \lambda_1=\frac{12375}{E_1(\mathrm{eV})} \mathrm{A}^{\circ}=1000 \mathrm{~A}^{\circ} \\ & \Rightarrow E_1=12.315 \mathrm{eV} \text { - (1) } \end{aligned}}

\mathrm{\text { similarly } E_2=\frac{12375}{\theta_2 \lambda_2} \mathrm{eV}=\frac{12375}{2000} \mathrm{eV}}

\mathrm{\Rightarrow E_2=6.1875 \mathrm{eV} .}

Now, \mathrm{E_1-W_0=e V_s ; E_2-W_0=e V_s^{\prime}}

\mathrm{\begin{aligned} & \Rightarrow 12.375-W_0=7.7 \mathrm{eV} \\ & \& 6.1875-\mathrm{W}_0=e \mathrm{~V}_{\mathrm{S}}{ }^{\prime} \\ & \Rightarrow V_S{ }^{\prime}=1.5 \mathrm{~V} \end{aligned}}

Posted by

Devendra Khairwa

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