Photoelectric Effect

Who accidentally discovered the photoelectric effect?

• Heinrich Hertz

• Albert Einstein

• Max Planck

• Niels Bohr

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What was one surprising experimental result of the photoelectric effect?

• The number of ejected electrons is independent of light intensity.

• The kinetic energy of ejected electrons is independent of light frequency.

• The photoelectric effect occurs only with visible light.

• The kinetic energy of ejected electrons is independent of light intensity.

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Which property of light affects the kinetic energy of ejected electrons in the photoelectric effect?

• Intensity

• Wavelength

• Frequency

• Amplitude

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What is the term for the minimum frequency required to observe the photoelectric effect?

• Threshold frequency

• Threshold intensity

• Maximum wavelength

• Minimum amplitude

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How quickly does the photoelectric effect occur when light is shone on a metal?

• Delayed by seconds

• Delayed by minutes

• Instantaneous

• Delayed by hours

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What happens when the intensity of light is increased in the photoelectric effect?

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What happens when the frequency of light is increased in the photoelectric effect?

• The number of ejected electrons increases.

• The intensity of light increases.

• The wavelength of light increases.

• The kinetic energy of ejected electrons increases.

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What did experiments show about the timing of electron ejection in the photoelectric effect?

• Electrons are ejected after a delay when light is shone on a metal.

• Electrons are ejected only if the light is very bright.

• Electrons are ejected immediately when light is shone on a metal.

• Electrons are ejected only if the light is very dim.

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What was the classical theory of light before the discovery of the photoelectric effect?

• Light is a stream of particles.

• Light is a sound wave.

• Light is a gravitational wave.

• Light is an electromagnetic wave.

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What concept did the photoelectric effect help to establish?

• Classical wave theory

• Newtonian mechanics

• Quantum nature of light

• General relativity

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