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An electron orbiting a proton in the n=2 state of hydrogen has speed v. The electron is put in the n=3 state of hydrogen. What is the speed of the electron in the new orbit?

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Important Questions on Quantum and Nuclear Physics (HL)

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Diploma
IMPORTANT
A particle of mass m is confined within a region of linear size L. Which is an order of magnitude estimate of the particle’s kinetic energy?
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Diploma
IMPORTANT
Two beams of electrons of the same energy approach two potential barriers of the same height. One barrier has width w and the other width 2 w. Which is a correct comparison of the tunnelling probability and the de Broglie wavelength of the transmitted electrons in the two beams?
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Diploma
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The graph shows the wavefunction of a particle. Near which position is the particle most likely to be found?

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The activity of a pure radioactive sample is A when the number of nuclei present in the sample is N. Which graph shows the variation of A with N?
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Diploma
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Alpha particles of energy E are directed at a thin metallic foil made out of atoms of atomic number Z. For what values of E and Z are deviations from Rutherford scattering likely to be observed?

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Diploma
IMPORTANT
Which is evidence for the existence of nuclear energy levels?
EASY
Diploma
IMPORTANT
State one feature of the photoelectric effect that cannot be explained by the wave theory of light.
EASY
Diploma
IMPORTANT
Describe how the feature of the photoelectric effect that cannot be explained by the wave theory of light is explained by the photon theory of light.