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Concepts Of Physics MCQ Edition [Volume 2]PhysicsBohr's Model and Physics of the Atom

When a photon is emitted by a hydrogen atom, it carries momentum. Calculate the momentum carried by the photon if a hydrogen atom emits light of wavelength 656.3 nm .

Options

  1. A3.3 10⁻²⁷ kg m s ⁻¹
  2. B2.0 10⁻²⁷ kg m s ⁻¹
  3. C1.0 10⁻²⁷ kg m s ⁻¹
  4. D1.0 10⁻¹⁹ kg m s ⁻¹

Correct answer

C. 1.0 10⁻²⁷ kg m s ⁻¹

Step-by-step solution

The momentum of a photon is given by the de Broglie relation: p = h Given: Wavelength = 656.3 nm = 656.3 10⁻⁹ m Planck's constant h = 6.63 10⁻³⁴ J s Substituting the values: p = 6.63 10⁻³⁴ 656.3 10⁻⁹ p = 6.63 6.563 10⁻²⁷ p 1.0 10⁻²⁷ kg m s ⁻¹

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