Q.

Wavelength of the first line of Paschen series is −  R=109700 cm−1

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a

18750Ao

b

2854Ao

c

3452Ao

d

6243Ao

answer is A.

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Detailed Solution

ν¯ =1λ=R1n12-1n22 First line of paschen is 4(n2)→3 (n1) ν¯ =1λ=10970019-116           λ =18752×10-8cm ≈18750Ao
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Wavelength of the first line of Paschen series is −  R=109700 cm−1