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Q.

Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spectral series which has an upper limit of wavelength equal to 18752 Å is

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a

Balmer series

b

Lyman series

c

Paschen series

d

Pfund series

answer is C.

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Detailed Solution

1λ=R1n12−1n22⇒1n12−1n22=1Rλ∣ =11.097×107×18752×10−10=0.0486=7144. But 132−142=7144⇒n1=3 and n2=4 (Paschen series)
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