sree lakshmi
Last Activity: 5 Years ago
Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths λ1:λ2 emitted in the two cases is
ans; 1st the electron jumps from 3rd excited state to the 2nd ie from n=4 to n=3
then 1/λ1 =R(1/n12 -1/n22 )= R ( 1/9 – 1/16) =R (7/144)
similarly 1/λ2 = R ( ¼ – 1/9 )=R(5/36)
∴ λ1/λ2 = 1/R(144/7) * R (5/36) =4*5/7 =20/7
so the ans is 20/7