AP Physics 2 Photoelectric Effect

Photoelectric effect provides the evidence for the ______ nature of radiation.

• dual

• wave

• particle

• electromagnetic

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If the brightness of a beam of light increases without changing its color, the ______ will increase.

• number of photons

• frequency of the light

• energy of the photons

• wavelength of the photons

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Light of a given wavelength is used to illuminate the surface of a metal. However, no photoelectrons are emitted. In order to cause electrons to be ejected, light of __________ should be used.

• lower energy

• higher intensity

• shorter frequency

• higher frequency

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The energy of a photon is directly proportional to its _____ and inversely proportional to its ______.

• intensity - speed

• wavelength - frequency

• frequency - wavelength

• intensity - wavelength

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NGSS.HS-PS4-1

Use the graph to find the threshold frequency.

• −12×10^-19 Hz

• 0 Hz

• 2×10¹⁵ Hz

• 4×10¹⁵ Hz

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In the photoelectric effect, if the incident photons have a wavelength that is larger than the threshold wavelength, _______.

• electrons will be ejected from the metal surface

• there will be photoelectric current

• no electrons will be emitted from the metal surface

• the kinetic energy of the ejected electrons increases

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What is the energy of a photon with a frequency of 5x10¹⁴ Hz? (you need to do calculation. You have enough time)

• 2.5x10^-19 J

• 3.0x10^-19 J

• 3.3x10^-19 J

• 4.5x10^-19 J

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NGSS.HS-PS4-1

A student has 3 lasers red, green and blue.
When the green laser is shone onto a metal surface electrons are released

• the blue laser will release more electrons
• the red laser won't release electrons
• the cut-off wavelength is shorter than the wavelength of green light.
• the blue laser will release more energetic electrons

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This image is an illustration of

• photoelectric effect
• Dalton's atomic theory
• Bohr model
• Quantum mechanical model

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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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