wavelength = 397 nm
= 3.97*10^-7 m
Here photon will be emitted
1/lambda = R* (1/nf^2 - 1/ni^2)
R is Rydberg constant. R = 1.097*10^7
1/lambda = R* (1/nf^2 - 1/ni^2)
1/3.97*10^-7 = 1.097*10^7*(1/nf^2 - 1/7^2)
(1/nf^2 - 1/7^2) = 0.2296
1/nf^2 = 0.25
nf^2 = 4
nf = 2
Answer: 2
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