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Q.

The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is 1615Rcm.

  What is the value of n2 ? (where, R = Rydberg constant)

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a

2

b

3

c

4

d

1

answer is C.

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Detailed Solution

For Lyman series, 1λ = R [112 − 1n22] ⇒ 15R16 = R [112 − 1n22]

15R16R = [n22 − 1n22]

⇒ 1516 = n22 − 1n22

15 n22 = 16n22−16

⇒ n22 = 16 n2 = 4

 

 

 

 

 

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