BRAINCAKEExam Question 4
Question
In an electron diffraction tube, electrons are accelerated from rest through a potential difference of 150 V and then pass through a thin film of graphite. The spacing between the layers of atoms in graphite is about 1 × 10-10 m.
(a) Calculate the kinetic energy of each electron. (1)
(b) Show that the momentum of each electron is about 6.6 × 10-24 kg m s-1. (2)
(c) Calculate the de Broglie wavelength of the electrons and explain why they are diffracted by the graphite. (3)
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Key terms in this lesson
- de broglie wavelength
- The wavelength associated with a moving particle, equal to the Planck constant divided by its momentum.
More in Quantum Physics
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All 21 lessons in Quantum Physics · All Edexcel AS-level Physics topics