Practicing Success
The experimental setup used for the photoelectric effect is shown. It consists of an evacuated glass/quartz tube having a thin photosensitive plate C and another metal plate A. Light from the source S of sufficiently short wavelength passes through the window W and falls on the photosensitive plate C (emitter). The electrons are emitted by the plate C and are collected by the plate A (collector), by the electric field created by the battery. The battery maintains the potential difference between the plates C and A, that can be varied. Thus, the plate A can be maintained at a desired positive or negative potential with respect to emitter C. When the collector plate A is positive with respect to the emitter plate C, the electrons are attracted to it. The emission of electrons causes flow of electric current in the circuit called the photoelectric current. |
If I1, I2 and I3 are such that I1>I2>I3, what can we say about the stopping potentials for them?
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V1<V2<V3 V1>V2>V3 V1=V2=V3 cannot say |
V1=V2=V3 |
FOR A GIVEN FREQUENCY OF INCIDENT RADIATION, THE STOPPING POTENTIAL IS INDEPENDENT OF ITS INTENSITY. |