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AQA - A Level Physics - Particles and radiation #6

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Quiz by Nighthawk
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Last updated: July 8, 2020
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First submittedJuly 8, 2020
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Hint
Answer
What happens in terms of quarks during beta minus decay
A down quark (in a neutron) turns into an up quark (in a proton)
What happens in terms of quarks during beta plus decay
An up quark (in a proton) turns into an down quark (in a neutron)
When is strangeness conserved?
Strong interaction
The energy of a photon is inversely proportional to…?
Wavelength
Define threshold frequency
The minimum frequency of light required to produce photoelectrons
Define work function of a metal
The minimum energy required to remove an electron from the surface of the metal
How do you calculate the threshold frequency from the work function?
Divide the work function by Planck's constant
What happens to the photon energy if frequency is doubled?
Doubled
What happens to the number of photoelectrons per second if the intensity of light remains the same but frequency is doubled?
Halved
What happens to the photoelectrons produced if the intensity of a light source is increased but the frequency is constant?
More photoelectrons will be produced but they will have the same maximum kinetic energy
Why does the kinetic energy of photoelectrons from monochromatic light vary in the photoelectric effect?
The work function is a minimum energy. Some electrons require more energy to be liberated.
Hint
Answer
Define the ground state of an atom
The lowest energy level an electron can occupy
Define ionisation
The addition or removal of an electron from a neutral atom.
Define ionisation energy
The energy required to remove an electron that is in the ground state of an atom.
Define excitation of an atom
The atom gains energy and an electron moves up to a higher energy level.
Which processes can lead to the excitation of an atom
A collision with a charged particle ,The absorption of a photon by an electron in the atom.
Describe the de-excitation of an atom
An electron moves down energy levels and emits a photon
What two variables determine the De Broglie wavelength of a particle?
Mass and velocity
Which key piece of evidence that demonstrated the validity of De Broglie's matter-wave hypothesis?
Electron diffraction through a thin metal foil
A photon can ionise an atom if its energy is greater than …?
the ionisation energy
Two factors that determine the maximum kinetic energy of photoelectrons are…?
The frequency of the light and the work function of the metal
A photon can produce a photoelectron if its frequency is greater than
the threshold frequency
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