The photoelectric effect

The frequency below which no electrons are emitted from metal surface is called the:

• minimum frequency

• angular frequency

• maximum frequency

• threshold frequency

In the photoelectric effect, most electrons are removed from the:

• inner shells

• surface

• from core

• nucleus

The maximum Kinetic Energy of photoelectrons increases with increasing frequency

• True

• False

The number of photoelectrons emitted per second (rate of photoelectrons emission) from a given metal is directly proportional to intensity. It is independent of frequency

• True

• False

If the frequency of incident radiation is more than threshold frequency, the process of photoelectric effect takes place _____

• slowly

• rapidly

• gradually

• instantaneously

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.

Tags

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.

The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
Plank's constant is determined by:

• the x-intercept.
• the y-intercept.
• the gradient.
• the area under the graph.

Tags

NGSS.HS-PS4-3