1.

Momentum of an electron, when a potential difference of 500 volt is applied across the electrodes of CRT in SI units is :

Answer»

`1.6xx10^(-19)`
`1.9xx10^(-27)`
`9.1xx10^(-27)`
`1.2xx10^(-23)`

Solution :p=MV
Now `eV=(1)/(2)mv^(2)`
`:. V^(2)=(2EV)/(m) rArr v= sqrt((2eV)/(m))`
`:. P=m sqrt((2eV)/(m))= sqrt(2meV)==1*2xx10^-(-23)` SI units


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