Question

Calculate the wavelength of second line of Lyman series in hydrogen spectra

Answer 1

lymanseries second line means electron jumps from 3level to second level

n1=1,n2=3

R is constnt=1.08×10power7

1/wavelength=1.08×10power7 [1|n1square_1/n2square]

wavelength=10.4×10powerminus8 metres

Answer 2

1/ λ = R[1/n₁² - 1/n₂²]

For second line of Lyman series
n₁ = 1 and n₂ = 3

1/λ = R[1/1² - 1/3²]
= 8R/9

λ = 9 / (8R)
= 9 / (8 × 1.097 × 10^7 m^1)
= 102.5 nm

∴ Wavelength of second line of Lyman series is 102.5 nm