A-Level Physics 3.2-Quantum Physics
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What is photoelectric effect. [1 mark]
Photon has enough energy to emit electron from metal surface.
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Define threshold frequency. [1 mark]
Minimum frequency of photon needed to emit electron from metal surface.
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Defined work function. [1 mark]
Minimum photon energy needed to emit electron from metal surface.
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Explain how flowescent tube create white light. [4 marks]
Free electron accelerated by high voltage.
Collide with electron in mercury vapour which excited to higher energy level.
UV photon emitted and absorbed by the coating.
Different frequency of visible light combine to white light.
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