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. Oil spreads over the surface of water where as water does not spread
2. Initial angular velocity of a circular disc of mass M is ?￢ﾂﾁ.Then, two small spheres
3. A boy playing on the roof of a 10m high building throws a ball with a speed
4. A rod of weight W is supported by two parallel knife edge A and B
5. If vₑ is escape velocity and vₙ is orbital velocity of a satellite

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