Question
Wed January 02, 2013 By:

ans

Expert Reply
Wed January 02, 2013
The thrid pin in a 3 pin plug longer than the other two pins.It is made longer so that it gets connected to the earth terminal earlier than the live and neutral pins. This ensures the safety of the user.
Factors  that affect the rate of emission of elctrons in a photoelectic cell
1.Work function of the material that is used as cathode.
2.Intensity of light
3. area of cross-section

difference between a beta particle and an electron:

Beta particle are high-speed electron or positron, usually emitted by an atomic nucleus undergoing radioactive decay, where as eletrons are stationary

this is the only difference between electron and beta particle


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