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

The Balmer series or Balmer lines in atomic physics, is the designation of one of a set of six named series describing the spectral line emissions of the hydrogen atom. The Balmer series is calculated using the Balmer formula, an empirical equation discovered by Johann Balmer in 1885. this is all I know sorry

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

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