1.

If an electron in hydrogen atom jumps from an orbit of level n= 3 to an orbit of level n =2, the emitted radiation has a frequency (R= Rydberg constant, c= velocity of light) :

Answer»

`(RC)/(25)`
`(5Rc)/(36)`
`(3Rc)/(27)`
`(8Rc)/(9)`

Solution :`1/lambda=R_(H) (1/n_(F)^(2)-1/n_(i)^(2))`
`c/lambda=Rc (1/n_(f)^(2)-1/n_(i)^(2))`
`v=Rc (1/2^(2)-1/3^(2))`
`=Rc (1/4-1/9)`
`v=5/(36)Rc`.


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