A-level Physics Revision

Light of a single wavelength is incident on a metal.  Electrons are released. The intensity of the light is then increased.
Which of the following changes occur?

• Rate of electron emission: increase.
  Energy of electrons: increase.
• Rate of electron emission: decrease.
  Energy of electrons: no change.
• Rate of electron emission: decrease.
  Energy of electrons: increase.
• Rate of electron emission: increase.
  Energy of electrons: no change.

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The photoelectric effect only occurs if the light shining on the metal is:

• coherent.
• above a minimum intensity.
• above a minimum frequency.
• above a minimum wavelength.

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The photoelectric effect helps us to understand

• the particle nature of light.
• diffraction pattern produced as light passes through a single slit.
• the wave behavior of light.
• spectroscopes.

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Minimum frequency at which radiation causes the ejection of electrons from a metal

• stimulated emission
• photoelectric effect
• threshold frequency
• polarization

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Who was awarded the nobel prize for his work on the photoelectric effect?

• Hans Christian Oersted
• Michael Faraday
• Albert Einstein
• Max Planck

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What is the experiment where light is shone on the surface of metal, causing electrons to be emitted?

• photoelectric effect
• photon effect
• quantum mechanical effect
• quantized effect

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What must the minimum energy of photons falling ona copper plate be in order to observe the photoelectriceffect? (work function for copper 4.7 eV)

• 2.35 eV
• 1.175 eV
• 4.7 eV
• 9.4 eV

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What is the maximum kinetic energy of electrons emitted from cesium (Cs), when light of frequency10¹⁵ Hz falls upon the metal? (work function for Cs is 1.8 eV)

• 7.728x10^-19 J
• 4.83 eV
• 1.864x10^-19 J
• 2.34 eV

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The photoelectric effect is observed on barium oxide(BaO) at a minimum frequency of 0.24x10¹⁵ Hz . Find the work function of bariumoxide in eV.

• 1 eV
• 2 eV
• 1.6 eV
• 2.7 eV

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The cut-off wavelength for the photoelectric effect of platinum is 220 nm. Find the work function of platinum in eV

• 11.25 eV
• 9 eV
• 4.5 eV
• 5.65 eV

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