Atomic Structure - Result Question 102

####78. Calculate the wave number for the shortest wavelength transition in the Balmer series of atomic hydrogen(1996, 1M)

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Answer:

Correct Answer: 78. (3.66×105cm) 87. (1220\AA)

Solution:

  1. The Rydberg’s equation for H-atom is

1λ=v¯( wave number )=RH(1n121n22)

For Balmer series, n1=2 and n2=3,4,5,,

For shortest λ,n2 has to be maximum, i.e. infinity. Then

v¯=RH(141)=RH4=1.09×1074=2.725×106m1



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