#### Answer

d. 4

#### Work Step by Step

Ground state: n = 1
Second highest state, n = 3
Absorption of longest possible wavelength implies minimum energy, hence next possible excited state will be n = 3+1 = 4

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Published by
Pearson

ISBN 10:
0-32160-183-1

ISBN 13:
978-0-32160-183-4

d. 4

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