Photoelectric Effect

In the photoelectric effect, the maximum speed of the electrons emitted by a metal surface when it is illuminated by light depends on which of the following?

I. Intensity of the light

II. Frequency of the light

III. Nature of the photoelectric surface

• I only

• I and II only

• III only

• II and III only

• All three

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

In an experiment, light of a particular wavelength is incident on a metal surface, and electrons are emitted from the surface as a result. To produce more electrons per unit time but with less kinetic energy per electron, the experimenter should do which of the following?

• Increase the intensity and decrease the wavelength of the light.

• Increase the intensity and the wavelength of the light.

• Decrease the intensity and the wavelength of the light.

• Decrease the intensity and increase the wavelength of the light.

• None of the above would produce the desired result.

Tags

NGSS.HS-PS4-3

The work function for a metal is φ. What is the threshold frequency of incident light required for the emission of photoelectrons from a cathode made of that metal?

• φ/h

• h/φ

• φh

• φ/hc

• hc/φ

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Which graph best shows the maximum kinetic energy K of the photoelectrons as a function of the frequency of incident light?

• A

• B

• C

• D

• E

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Which graph best shows the maximum kinetic energy K of the photoelectrons as a function of the intensity of incident light?

• A

• B

• C

• D

• E

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

The graph shows the maximum kinetic energy of electrons released in the photoelectric effect as a function of the frequency of the incident light. This graph is often used as evidence of the particle nature of light. The graph supports which of the following statements? Select two answers.

• The number of photoelectrons increases as the frequency increases.

• There is a threshold frequency below which no photoemission occurs.

• The energy of photoelectrons depends on the energy of the incoming light.

• The intensity of the incoming light determines whether photoemission occurs.

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4