The wavelength of light emitted from second orbit to first orbit in a hydrogen atom is

⇦

⇨

The wavelength of light emitted from second orbit to first orbit in a hydrogen atom is

Options

(a) 1.215×10⁻⁷ m
(b) 1.215×10⁻⁵ m
(c) 1.215×10⁻⁴ m
(d) 1.215×10⁻³ m

Correct Answer:

1.215×10⁻⁷ m

Explanation:

For hydrogen atom, energy = -(13.6 / n²) eV
Energy radiated = 13.6 [(1/1²) – (1/2²)] = [(13.6 × 3) / 4] eV
Energy = hc / λ = [(6.6 × 10⁻³⁴ × 3 × 10⁸) / λ × 1.6 × 10⁻¹⁹] eV
[(13.6 × 3) / 4] = [(6.6 × 10⁻³⁴ × 3 × 10⁸) / λ × 1.6 × 10⁻¹⁹]
λ = (6.6 × 3 × 4 × 10⁻²⁶) / (13.6 × 3 × 1.6 × 10⁻¹⁹) = 1.215 × 10⁻⁷ m

Related Questions:

1. A battery of e.m.f. E and internal resistance r is connected to an external resistance
2. Under the action of a force F=cx, the position of a body changes from 0 to x.The work done
3. If both the resistance and the inductance in an LR AC series circuit are doubled
4. In a mass spectrometer used for measuring the masses of ions, the ions
5. When aluminium is added as an impurity to silicon, the resulting material is

Topics: Atoms and Nuclei (136)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends