A caesium photocell, with a steady potential | vedclass

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Question

(a) Number of photo electrons
$(N)$ = Intensity $ \propto \frac{1}{{{d^2}}}$

$\Rightarrow \frac{{{N_1}}}{{{N_2}}} = {\left( {\frac{{{d_2}}}{{{d_1}

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Are one quarter as numerous

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(a) Number of photo electrons
$(N)$ = Intensity $ \propto \frac{1}{{{d^2}}}$

$\Rightarrow \frac{{{N_1}}}{{{N_2}}} = {\left( {\frac{{{d_2}}}{{{d_1}}}} \right)^2}$

$ \Rightarrow \frac{{{N_1}}}{{{N_2}}} = {\left( {\frac{{100}}{{50}}} \right)^2} = \frac{4}{1} $

$\Rightarrow {N_2} = \frac{{{N_1}}}{4}$.

$(A)$ Hallwachs $\&$ Lenard	$(P)$ Transformers
$(B)$ Franck-Hertz	$(Q)$ Microwave
$(C)$ Klystron valve	$(R)$ Quantization of energy levels
$(D)$ Nicola Tesla	$(S)$ Photoelectric effect

A caesium photocell, with a steady potential difference of $60V$ across, is illuminated by a bright point source of light $50 cm$ away. When the same light is placed 1m away the photoelectrons emitted from the cell

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$(B)$ Franck-Hertz $(Q)$ Microwave

$(C)$ Klystron valve $(R)$ Quantization of energy levels

$(D)$ Nicola Tesla $(S)$ Photoelectric effect