Power per unit area, sometimes referred to as radiation flux density
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What is the photoelectric effect?
Light causing the emission of electrons from the surface of a metal
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What are photons?
Discrete bundles of energy, each with energy hf
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How does the photoelectric effect work?
Light is shone on a metal, if the frequency of the light is high enough, the photons will have enough energy (hf) to displace an electron in a 1:1 ratio.
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What is the work function?
The minimum amount of energy a photon needs to displace an electron from the surface of a metal
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What is the threshold frequency?
The minimum frequency which gives photons enough energy to displace electrons from the surface of a metal
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What is ground state?
The lowest possible energy level of an electron
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What is ionisation energy?
The energy that must be supplied for an electron in ground state to escape the atom
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What is an emission spectrum?
Spectrum of frequencies of electromagnetic radiation emitted when the electrons in an atom make a transition from a high energy state to a lower energy state
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What is an absorption spectrum?
Spectrum of frequencies that are absorbed that match the energy difference between two quantum states of electrons
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Evidence for light being a wave?
Polarisation, diffraction, interference
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Evidence for light being particles?
Photoelectric effect, atomic spectra
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Evidence for electrons acting as a wave?
Diffraction
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Other cards in this set
Card 2
Front
What is the photoelectric effect?
Back
Light causing the emission of electrons from the surface of a metal
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