CAPE Physics Unit 2 · 2002 · Paper 1 · Question 7(b)(i)
An electron is accelerated from rest through a potential difference of 5.3 kV.
Calculate its de Broglie wavelength.
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Practise this questionOther parts of this question
- 7(a)(i)Write an equation relating the energy E associated with a photon to its wavelength λ.[1 mark]
- 7(a)(ii)Write an equation relating Einstein's mass-energy relationship.[1 mark]
- 7(a)(iii)Hence, derive the de Broglie equation which suggests the wave-particle nature of light.[2 marks]
- 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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