If wavelength of the first line of the Paschen series of hydrogen atom is 720 nm, then the wavelength of the second line of this series is nm (nearest integer).

Question

If wavelength of the first line of the Paschen series of hydrogen atom is 720 nm, then the wavelength of the second line of this series is  nm (nearest integer).

Canvas Classes · Accepted Answer

Paschen series: transitions to

First line:

Second line:

Ratio:

Answer: 492

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