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)