Atoms - Result Question 16

17. Hydrogen atom in ground state is excited by a monochromatic radiation of λ=975\AA. Number of spectral lines in the resulting spectrum emitted will be

[2014]

(a) 3

(b) 2

(c) 6

(d) 10

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Answer:

Correct Answer: 17. (c)

Solution:

  1. (c) For the λ=975\AA

1λ=R(1n121n22)

where R is the Rydberg constant

Solving we get n2=n=4

( n1=1 ground state)

Therefore number of spectral lines

=n(n1)2=4(41)2=6



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