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15

• Spectroscopists discovered several series of H spectral lines in  other regions of the electromagnetic spectrum.

• Each series showed a similar pattern.

• Equations of the form below, (Rydberg equation) were found to  predict the position and wavelength of any line in a given series:

Where n 1 and n 2 are postive integers with n 2 > n 1 , and R is the Rydberg constant (1.096776 x 10 7 m –1 ).

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