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In a photoelectric experiment, a monochr...

In a photoelectric experiment, a monochromatic light is incident on the metal plate A. It was observed that with `V = 5 "volt"`, the maximum kinetic energy of photoelectrons striking plate B was `1 eV`. The polarity of the applied potential difference was as shown in figure (a). With polarity of the applied potential difference reversed (as shown in figure (b)) and frequency of incident light doubled, it was observed that in saturation state, the kinetic energy of electrons striking plate B ranged between 5 eV to 20 eV. Find the work function of metal used in plate A.

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The correct Answer is:
`phi = 3 eV`
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