Quantum Phenomena

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What is the Photoelectric effect?
Emission of electrons from a metals surface due to exposure to electromagnetic radiation
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What is Excitation?
Electron moved to a higher energy level
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How is excitation caused?
Collision of electrons or an atom absorbs a photon
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What is the electron Volt?
Unit of energy equal to the work done when an electron is moved through P.D of 1 volt
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How are mercury atoms excited in fluorescent tube?
electrons flow; collide with orbiting electrons; raising electrons to higher energy level
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Why does photoelectric effect not occur below threshold frequency?
Energy of photons depend on frequency; hence below threshold frequency photon does not have enough energy to liberate electron (idea of work function)
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What Is wave particle duality?
Matter particles have a wave-like and particle-like nature. e.g: photons
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What is an example of particle-like nature of light?
Photoelectric effect
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What is an example of wave-like nature of light?
Diffraction of light; Spreading of waves on passing through a gap
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Card 2

Front

What is Excitation?

Back

Electron moved to a higher energy level

Card 3

Front

How is excitation caused?

Back

Preview of the front of card 3

Card 4

Front

What is the electron Volt?

Back

Preview of the front of card 4

Card 5

Front

How are mercury atoms excited in fluorescent tube?

Back

Preview of the front of card 5
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