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Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H-atom is suitable for this purpose?

[RH=1×105cm1,h=6.6×1034Js,c=3×108ms1]

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a
Paschen, 53
b
Paschen, 3
c
Lyman, 1
d
Balmer, 2

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detailed solution

Correct option is B

1λ=RHZ21n12-1n22

105×12132-12

λ= 9 x 10-5 cm = 9 x 10-5 cm x 107nm/cm = 900 nm

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