In an electron diffraction experiment, electrons are fired at a thin graphite target. To observe a clear diffraction pattern, the de Broglie wavelength of the electrons must be of the same order of magnitude as the spacing between the carbon atoms in the graphite lattice, which is approximately 10−10 m10^{-10} \text{ m}10−10 m.
What is the best estimate of the momentum of one of these diffracted electrons?
10−34 kg m s−110^{-34} \text{ kg m s}^{-1}10−34 kg m s−1
10−24 kg m s−110^{-24} \text{ kg m s}^{-1}10−24 kg m s−1
10−19 kg m s−110^{-19} \text{ kg m s}^{-1}10−19 kg m s−1
10−14 kg m s−110^{-14} \text{ kg m s}^{-1}10−14 kg m s−1
26 exam-style questions on OCR A A Level Physics Quantum physics, covering Photons, The photoelectric effect, and Wave–particle duality. Each one has a worked solution and a mark scheme showing where the marks go.