The Photoelectric Effect (Grade 12 NSC Matric Physical Sciences): Quizzes

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The Photoelectric Effect
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What is the photoelectric effect?

Emission of electrons when light hits a surface

What did Philipp Lenard discover in 1902 about ejected electrons?

Max velocity was independent of light intensity

What did Einstein propose light is made up of?

Packets of energy called quanta (photons)

What is the work function (W0W_0)?

Min energy to knock an electron out of metal

Which formula relates work function to threshold frequency?

W0=hf0W_0 = hf_0

What is Einstein's photoelectric equation?

Ekmax=hf−W0E_{k_{max}} = hf - W_0

What is the threshold frequency?

Min frequency below which no electrons emitted

What does light intensity affect in the photoelectric effect?

Number of photons, not their energy

What determines the max kinetic energy of emitted electrons?

Frequency of incident light

What process do solar cells use that is similar to photoelectric effect?

Photovoltaic effect

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