Exam code: H556
What can be deduced from the diffraction of electrons by a thin film of graphite?
Electrons are leptons.
Electrons are negatively charged.
Electrons interact with atoms on a one-to-one basis.
Electrons travel as waves.
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An electron has a de Broglie wavelength equal to the wavelength of X-rays.
What is the best estimate of the momentum of this electron?
10−30 kg ms−1
10−27 kg ms−1
10−23 kg ms−1
10−18 kg ms−1
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In an experiment the de Broglie wavelength of an electron after being accelerated through a potential difference (p.d) V is λ1.
The accelerating p.d is now tripled.
What is the new de Broglie wavelength of the electron in terms of λ1?
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A neutron has a kinetic energy of 9.00 x 10−18 J.
Which is the correct expression for the de Broglie wavelength λ of the neutron?
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Which graph shows the correct variation of the energy of a photon of light with its wavelength ?
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