If our eyes could see a slightly wider region of the electromagnetic spectrum, we would see a fifth line in the balmer series emission spectrum. calculate the wavelength λλlambda associated with the fifth line.

λ = 397 nm

Explanation:

given,

Rydberg wavelength equation for Balmer series

R is the Rydberg constant, R = 1.097 x 10⁷ m⁻¹

n_i = initial energy level  

n_f = final energy level

where as for Balmer series n_f = 2

            n_i = 7

Hence, the wavelength is equal to  λ = 397 nm

d is the correct answer