Photoelectric Effect

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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NGSS.HS-PS4-1

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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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NGSS.HS-PS4-3

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

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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NGSS.HS-PS4-3

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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NGSS.HS-PS4-3

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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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NGSS.HS-PS4-3

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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Find the cut-off wavelength for the photoelectriceffect in tungsten (work function for tungsten is 4.5 eV)

• 138 nm
• 414 nm
• 552 nm
• 276 nm

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NGSS.HS-PS4-1

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Green light with a wavelength of 5461 nm, emitted from a mercury lamp, ejects photoelectrons with a maximum kinetic energy of 0.13 eV from a metal surface. Calculate the work function of the metal.

• 2.14 eV

• 1.07 eV

• 3.21 eV

• 0.535 eV

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NGSS.HS-PS4-1