Chapter 17 - Photoelectric Effect

This image is an illustration of

• photoelectric effect
• Dalton's atomic theory
• Bohr model
• Quantum mechanical model

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Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?

• only high frequency
• only low frequency
• both of them
• doesn't depend to frequency

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What is the best description of 'threshold frequency'?

• The minimum energy needed for electrons to escape a surface.

• The maximum kinetic energy that an emitted electron has.

• The minimum frequency of a photon that will cause an electron to be emitted.

• The frequency that an emitted electron will have.

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Photoelectric effect provides the evidence for the ______ nature of radiation.

• dual

• wave

• particle

• electromagnetic

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Light of a given wavelength is used to illuminate the surface of a metal. However, no photoelectrons are emitted. In order to cause electrons to be ejected, light of __________ should be used.

• lower energy

• higher intensity

• shorter frequency

• higher frequency

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What is the energy, in eV, of a photon that has a wavelength of 620 nm?

• 1eV

• 2eV

• 3eV

• 4eV

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Use the graph to find the threshold frequency.

• −12×10^-19 Hz

• 0 Hz

• 2×10¹⁵ Hz

• 4×10¹⁵ Hz

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In the photoelectric effect, if the incident photons have a wavelength that is larger than the threshold wavelength, _______.

• electrons will be ejected from the metal surface

• there will be photoelectric current

• no electrons will be emitted from the metal surface

• the kinetic energy of the ejected electrons increases

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A metal with a work function of 3.5 eV is exposed to photons with an energy of 3.7 eV. What is the maximum kinetic energy of the emitted photoelectrons?

• 0.2 eV

• 0.9 eV

• 1.1 eV

• 7.7 eV

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What is the energy of a photon with a frequency of 5x10¹⁴ Hz? (you need to do calculation. You have enough time)

• 2.5x10^-19 J

• 3.0x10^-19 J

• 3.3x10^-19 J

• 4.5x10^-19 J

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