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Q. State any three laws of photo electric emission?
(i) For a specified photo sensitive material there is a minimum frequency called the threshold frequency below which emission of photoelectrons stops completely however great the intensity may be.
(ii) For a specified photosensitive material the photo electric current is directly proportional to the intensity of the incident radiation provided the frequency is greater than the threshold frequency.
(iii) The photoelectric release is an instantaneous process that is there is no time lag between the incidence of radiation and the emission of photo electrons.
(iv) The maximum kinetic energy of the photo electrons is straight proportional to the frequency of incident radiation, but is independent of its intensity.
Defects of Vision Long Sightened When a person can see far objects clearly but cannot see near object clearly then this defect of vision is called as long sightedness.
Each plate of a parallel plat capacitor has area 15 cm 2 and is being charged. The time rate of variation of electric field between the two plates of the capacitor is 12.6 x 10 9
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A mass floats with 1/3rd of its volume outside water what will be its relative density? Ans) 8/3 g/cc
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