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Q.

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

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a

Brackett series

b

Lyman series

c

Balmer series

d

Paschen series

answer is C.

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Detailed Solution

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Atomic spectrum of hydrogen consists of different spectral lines based on wave number values
R= Rydberg constant = 1.097 x 107 m-1
n1= Lower quantum number
n2= Higher quantum number
Balmer series: n1=2,n2>2
Four lines appears in visible region, others appear in the UV region.
1. Brackett series: n1=4,n2>4; all lines appears in IR region.
2. Lyman series: n1=1,n2>1; all lines appear in UV region.
4. Paschen series:n1=3,n2>3; all lines appear in near IR region.
Note: Humphrey series: n1=6,n2>6. All lines appear in IR region.

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