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## Homework Statement

In the Balmer series, how many spectral lines have the wavelength greater than 400 nm?

## Homework Equations

1/lambda= R(1/2^2-1/n^2)

lambda=wavelength

r=rhydberg constant 1.097x10^7

n= 3,4,5...

balmer series is visible light

## The Attempt at a Solution

ok so i know the balmer series starts with 400 nanometers because its visible light, but i don't understand how to see how many spectral lines have wavelength greater.