Modern Physics Ques 95
- In a photoelectric experiment set-up, photons of energy $5 eV$ falls on the cathode having work function $3 eV$. (a) If the saturation current is $i _A=4 \mu A$ for intensity $10^{-5} W / m^{2}$, then plot a graph between anode potential and current. (b) Also, draw a graph for intensity of incident radiation $2 \times 10^{-5} W / m^{2}$.
$(2003,2 M)$
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Solution:
Formula:
- Maximum kinetic energy of the photoelectrons would be
Therefore, the stopping potential is $2 V$. Saturation current depends on the intensity of light incident. When the intensity is doubled the saturation current will also become two fold. The corresponding graphs are shown in the above figure.
BETA
