Questions

Hydrogen atom in ground state is excited by a monochromatic radiation of $λ$ = 975 $\overset{ο}{A}$ . Number of spectral lines in the resulting spectrum emitted will be

Remember concepts with our Masterclasses.

80k Users

60 mins Expert Faculty Ask Questions

Ready to Test Your Skills?

Check Your Performance Today with our Free Mock Tests used by Toppers!

detailed solution

Correct option is C

Energy of the photon, E=hcλE=6.63×10-34×3×108975×10-10 J=6.63×10-34×3×108975×10-10×1.6×10-19eV=12.75eVAfter absorbing a photon of energy 1275 eV, the electron will reach to third excited state of energy-0.85 eV, since energy difference corresponding to n =1 and n = 4 is 12.75 eV. ∴ Number of spectral lines emitted=(n)(n-1)2=(4)(4-1)2=6

Talk to our academic expert!

Create Your Own Test
Your Topic, Your Difficulty, Your Pace

Similar Questions

In a sample of ions, a Li⁺⁺ ion electron in first Bohr orbit is excited to a level by a radiation of wavelength λ. When the ion gets de-excited to the ground state in all possible ways (including intermediate emissions), a total of six spectral lines are observed. What is the value of λ ?

$(Given, h = 6.63 \times 10^{- 34} Js, c = 3 \times 10^{8} {ms}^{- 1})$