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Which electronic transition in a hydroge...

Which electronic transition in a hydrogen atom, starting from the orbit n=7, will produce infrared light of wavelength 2170 nm?
`(Given: R_(H)=1.09677xx10^(7)M^(-1))`

A

`n=7 " to " n=6`

B

from `n=2` to `n=4`

C

from `n=5` to `n=1`

D

from `n=3` to `n=5`

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