AP Physics 2 Atomic Review

What color of light has the greatest energy per photon?

• Red

• Green

• Blue

• Violet

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A particle of light is called a...

• Photoelectron

• Photon

• Proton

• Electron

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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 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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What is the best description of 'threshold frequency'?

• The minimum energy needed for electrons to escape a surface.

• The maximum kinetic energy that an emitted electron has.

• The minimum frequency of a photon that will cause an electron to be emitted.

• The frequency that an emitted electron will have.

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The equation for the photoelectric effect is

eV = hf - Φ

The graph of electron energy against frequency is

• a straight line through the origin

• a straight line slope h

• a straight line with a positive y intercept

• not a straight line

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NGSS.HS-PS4-3

A surface has a work function of 4 x 10⁻¹⁹ J
What is the cut off wavelength?
h = 6.6 x 10⁻³⁴ Js
c = 3 x 10⁸ ms⁻¹

• 6.0 x 10⁻¹⁴ m
• 700nm
• 5 x 10⁻⁷ m
• 3 x 10⁻⁶ m

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The equation of motion of matter waves was derived by

• Heisenberg

• Bohr

• De Broglie

• Schrodinger

The energy of a photon corresponding to the visible light of maximum wavelength is approximately _______________

• 7 eV

• 1 eV

• 3.2 eV

• 1.76 eV

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Which of the following statement is correct?

• No particle whether at rest or in motion is ever accompanied by matter waves

• Any particle in motion, whether charged or uncharged is accompanied by matter waves

• Only subatomic particles in motion are accompanied by matter waves

• Only a charged particles in motion are accompanied by matter waves

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