Specify the formula for calculating the number the spectral lines in an hydrogen atom. Identify the number of spectral lines seen for hydrogen atom when electron jumps from n2 =5 and n1 =1 in visible region.

The formula for calculating spectral lines:

where,

n1 = lower energy level

n2 = higher energy level

Given n2 =5 and n1 =1

Substituting the values in the above equation we get, = 10

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