โฟโตอิเล็กทริคเอฟเฟกต์

A particle of light is called a...

• Photoelectron

• Photon

• Proton

• Electron

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NGSS.HS-PS4-3

The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light

• Intensity

• Wavelength

• Frequency

• Energy

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NGSS.HS-PS4-1

NGSS.HS-PS4-4

What color of light has the greatest energy per photon?

• Red

• Green

• Blue

• Violet

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NGSS.HS-PS4-1

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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NGSS.HS-PS4-4

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-PS4-3

NGSS.HS-PS4-4

This image is an illustration of

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

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NGSS.HS-PS4-3

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.

Tags

NGSS.HS-PS4-3

A metal with a work function of 3.5 eV is exposed to photons with an energy of 3.7 eV. What is the maximum kinetic energy of the emitted photoelectrons?

• 0.2 eV

• 0.9 eV

• 1.1 eV

• 7.7 eV

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

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.

Tags

NGSS.HS-PS4-3

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 gradient h
• a straight line with a positive y intercept
• not a straight line

Tags

NGSS.HS-PS4-1