1.

In hydrogon atom, electron excites from ground state to higher energy state and its orbital velocity is reduced to (1)/(3) rd of its initial value. The radius of the orbit in that higher energy state is :

Answer»

R 9
2 R
3 R
27 R

Solution :According to Bohr.s orbit
`mvr=(nh)/(2pi)`
`i.,e v PROP (1)/(r),(v_(1))/(v_(2))=(r_(2))/(v_(1))`
`:. (v)/(v//z)=(r_(2))/(R) rArr r_(2)=3R`.


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