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1 markAtomic Mass

CAPE Physics Unit 2 · 2002 · Paper 1 · Question 7(a)(ii)

Quantum physics and wave-particle duality.

Write an equation relating Einstein's mass-energy relationship.

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  1. 7(a)(i)Write an equation relating the energy E associated with a photon to its wavelength λ.[1 mark]
  2. 7(a)(iii)Hence, derive the de Broglie equation which suggests the wave-particle nature of light.[2 marks]
  3. 7(b)(i)Calculate its de Broglie wavelength.[4 marks]
  4. 7(b)(ii)An oscillating molecule de-excites from one allowed energy level to the next lower one, changing energy by 2.2 eV. Calculate the frequency of the emitted…[2 marks]

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