Quantum physics

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Which effect was only explained by light acting as a particle (photon)
Photoelectric effect
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What is a photon?
A quantum (packet) of EM radiation. They are neutral and transfer either all or none of their energy when interacting with an other particle.
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Energy carried by one wave packet?
E = hf = (hc)/wavelength
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Define an electronvolt
The kinetic energy gained by an electron when it is accelerated through a potential difference of 1 volt
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Explain the photoelectric effect
Free electrons on the surface of the metal absorb energy from the light. If electrons absorb enough energy, their bonds to the metal break - it's emitted from the surface. Emitted electrons are called photoelectrons
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What is the frequency called that, for a radiation below this value, no photoelectrons are emitted?
Threshold frequency
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What is the 'work function energy'?
the energy needed to break the bonds holding the electron to the surface of the metal
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State an example of light as a wave and as a particle
Wave - Interference and diffraction. Particle - Photoelectric effect.
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What was De Broglie's theory?
Wave-particle duality theory. 'If wave-like light showed particle properties, particles like electrons should be expected to show wave-like properties'
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Other cards in this set

Card 2

Front

What is a photon?

Back

A quantum (packet) of EM radiation. They are neutral and transfer either all or none of their energy when interacting with an other particle.

Card 3

Front

Energy carried by one wave packet?

Back

Preview of the front of card 3

Card 4

Front

Define an electronvolt

Back

Preview of the front of card 4

Card 5

Front

Explain the photoelectric effect

Back

Preview of the front of card 5
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