AP 2 Modern Physics

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 graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
Plank's constant is determined by:

• the x-intercept.
• the y-intercept.
• the gradient.
• the area under the graph.

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The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The threshold frequency is determined by:

• the x-intercept.
• the y-intercept.
• the gradient.
• the area under the graph.

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Which statement about the photoelectric effect is correct?

• Electrons are emitted instantaneously.
• Electrons are not emitted below a certain wavelength.
• You can change the energy of the electrons by changing the intensity.
• Electron energy is independent of frequency.

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The photoelectric effect is when:

• Electrons collide inside a metal to release photons.
• One incident metal electron releases one photon.
• One incident photon releases one electron from a metal.
• Photons are absorbed in to metal ions releasing electrons.

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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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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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Do the photons of violet light or the photons of red light, falling on a metal surface with the same intensity,cause emission of more electrons?

•  red light
• violet light
• same 

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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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