Heat treatement of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this ? Given : Rydberg constant RH = 105 cm–1, h = 6.6 × 10–34 Js, c =

Question

Heat treatement of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this ? Given : Rydberg constant RH = 105 cm–1, h = 6.6 × 10–34 Js, c = 3 × 108 m/s)

(A) Lyman series, 1
(B) Paschen series, 5 3
(C) Paschen series, 3
(D) Balmer series, 2

Prashant Kotian · Accepted Answer

Correct answer: C.  1 = RZ2        2 1 n n  1 = 105 cm–1 × 12         2 3  = 9 × 10–5 cm = 9 × 10–7 m = 900 × 10–9 m = 900 nm, Paschen series,   3

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