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Dual Nature of Radiation and Matter

A point source causing photoelectric emission from a metallic plate is moved away from the plate. The variation of photoelectric current with distance

Question

A point source causing photoelectric emission from a metallic plate is moved away from the plate. The variation of photoelectric current with distance from the source is correctly represented by the graph _____________.
Fill in the blank with the correct answer from the options given below.

Solution

Correct option is C

We know that photo current directly proportional to intensity of the incident light. But intensity is inversely proportional to the square of the distance.