Unit 10 - Target #2

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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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

NGSS.HS-PS4-4

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-PS4-4

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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NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-PS4-4

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

• stimulated emission
• photoelectric effect
• threshold frequency
• polarization

The maximum Kinetic Energy of photoelectrons increases with increase in frequency. It is independent of intensity

• True

• False

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.

Brightness of light means the same thing as. 

• Energy of light
• Amplitude of light
• Frequency of light
• Color of light

In the photoelectric effect experiment we tested the results of increasing the amplitude of the incident light.  In our results we actually found that increasing only the amplitude of the incident light

• ejected more electrons from the metal with the same energy
• ejected less electrons from the metal with the same energy
• ejected the same number of electrons but each with more energy
• ejected the same number of electrons but each with less energy

In the photoelectric effect experiment we tested the results of increasing the brightness of the incident light.  In our results we actually found that increasing the brightness of the incident light

• ejected more electrons from the metal with the same energy
• ejected less electrons from the metal with the same energy
• ejected the same number of electrons but each with more energy
• ejected the same number of electrons but each with less energy