Atoms And Nuclei Question 442

Question: The extreme wavelengths of Paschen series are

Options:

A) 0.365μm and 0.565μm

B) 0.818μm and 1.89μm

C) 1.45μm and 4.04μm

D) 2.27μm and 7.43μm

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Answer:

Correct Answer: B

Solution:

(b) In Paschen series
1λmax=R[1(3)21(4)2]

Þ λmax=1447R=1447×1.1×107=1.89×106m=1.89,μm Similarly
λmin=9R=91.1×107=0.818,μm



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