1.

The transition from the state n =4 to n =3 is a hydrogen like atom results is ultraviolet radiation. Infrared radiations will be obtained in the transition :

Answer»

`2 to 1`
` 3 to 2`
`4 to 2`
`5 to 4`

Solution :`E_(n_(1)-n_(2))=-RZ^(2) (1/n_(2)^(2)-1/n_(1)^(2))`
`E_(4-3)=-Rz^(2) (1/4^(2)-1/3^(2)) =0.049Rz^(2)`
`E_(2-1)=-Rz^(2) (1/2^(2)-1/1^(2)) =0.75 Rz^(2)`
`E_(3-2)=-Rz^(2) (1/3^(2)-1/2^(2))=0.139Rz^(2)`
`E_(4-2)=-Rz^(2) (1/4^(2)-1/2^(2))=0.188 Rz^(2)`
`E_(5-4)=-Rz^(2) (1/5^(2)-1/4^(2)) =0.023 Rz^(2)`
Since `E_(5-4)`has to be less than `E_(4-3)`, so it is that of Infrared radiation.


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