Photoelectric effect

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

• Intensity

• Wavelength

• Frequency

• Energy

A particle of light is called a...

• Photoelectron

• Photon

• Proton

• Electron

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.

This image is an illustration of

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

Use the graph to find the threshold frequency.

• −12×10^-19 Hz

• 0 Hz

• 2×10¹⁵ Hz

• 4×10¹⁵ Hz

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 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.

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.

The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The work function is determined by:

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

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

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