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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