Plot a graph showing variation of photoelectric current with intensity of incident light. The work functions of Na and Mo are 2.75eV and 4.174eV. Which of these will not emit electrons when a laser beam of 3300A0 is used? Justify. What happens if the source of laser beam is brought closer?

Dear Student,
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Now as we know that ,


It is clear that this energy of the incident radiation is greater than the work function of Na but less than that of Mo , so emission will occur in Na.
When source of LASER beam is brought closer then the current will increase.

Regards

 

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