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Sunday, April 4, 2010

Important graphs: Intensity


Same frequency but different Intensity
The stopping potential is constant as there is no change in freq : eVs = hf - hfo.
DO not be alarmed where the stopping potential axis is. Can be in the positive axis as it is defined as stopping (negative wrt the photoelectric substance) .
As intensity increase the energy increase but the photon energy is constant (E=hf) . Hence the number of photons incident on plate increases and number of photoelectrons emitted increases and photocurrent increases.
Note: Photocurrent warrants you to talk about the number per second.