Question

The given graphs show the variation of photoelectric current (I) with the applied voltage (V) for two different materials and for two different intensities of the incident radiations. Identify the pairs of curves that correspond to different materials but same intensity of incident radiations.

Answer 1

The curves 1 and 3 correspond to the same intensity but different materials. 

The curves 2 and 4 correspond to same intensity but different materials.