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  4. Lenard observed that when UV-radiations were allowed to fall on the emitter plate of an evacuated glass tube enclosing two electrodes, current flows in the circuit as shown in figure. Reason is

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Q. Lenard observed that when UV-radiations were allowed to fall on the emitter plate of an evacuated glass tube enclosing two electrodes, current flows in the circuit as shown in figure. Reason isPhysics Question Image

Dual Nature of Radiation and Matter

Solution:

When ultraviolet radiations fall on the emitter plate, electrons are ejected from it which are attracted towards the positive collector plate by the electric field. The electrons flow through the evacuated glass tube, resulting in the current flow.