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Publish On: 2019-05-25

Peter

Total Post: 504

Question: Calculate the longest and shortest wavelengths in the Balmer series of Hydrogen atom. Given Rydberg constant = 1.0987 × 107 m-1

Reply On: 2013-10-10

lala singh

Total Post: 22

ANS: Calculate the longest and shortest wavelengths in the Balmer series of Hydrogen atom. Given Rydberg constant = 1.0987 × 107 m-1

The wavelength () of different spectral lines of Balmer series is given by

1/ = R [1/22 – 1/n22]

Longest wavelength is of Ha line or 1st line of the series. For which n2 = 3

Therefore 1/ = 1.097 × 107 [1/22 – 1/32]

= 1.097 × 107 × 5/36

= [36/ (5 × 1.097 × 107)] Å

For shortest wavelength, n2 = ∞

Therefore, 1/ = 1.097 × 107 [1/22 – 1/∞2]

= (1.097 × 107)/ 4

= (4/1.097 × 107) m

= 4 × 1010 Å /1.097 × 107

= 3646 Å
 

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