Light & Quantized Energy

If the frequency of incident radiation is more than threshold frequency, the process of photoelectric effect takes place _____

• slowly

• rapidly

• gradually

• instantaneously

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The energy of photoelectrons emitted from a metal surface can be increased by

• using light of higher frequency.

• using light of longer wavelength.

• using light of higher intensity.

• using monochromatic, polarized light.

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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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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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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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Energy absorbed by electron is used in

• A. escaping metal

• B. increasing kinetic energy

• C. both A and B

• D. increasing frequency

A metal surface is illuminated with a beam of monochromatic electromagnetic radiation. What determines the maximum speed of the photoelectrons that are emitted from the surface?

• the intensity of the radiation only

• the frequency of the radiation only

• the intensity and the frequency of the radiation

• the frequency of the radiation and the work function of the metal

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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 diagram shows a circuit involving a photoelectric cell. When UV light is shone onto the metal cathode, electrons are emitted establishing a photocurrent.
Which of the following changes could cause the photocurrent to stop?

• Increasing the potential difference of the power supply.
• Increasing the frequency of the UV light.
• Increasing the intensity of the UV light.
• Changing the metal surface to one with a smaller work function.

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Find the threshold wavelength for the photoelectric effect in tungsten (work function for tungsten is 4.5 eV)

• 138 nm

• 414 nm

• 552 nm

• 276 nm

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