Difference between revisions of "Photoelectric Effect"
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: The '''Photoelectric Effect''' is proof of the [[photon]] model of [[light]]. | : The '''Photoelectric Effect''' is proof of the [[photon]] model of [[light]]. | ||
: The emission of [[photoelectron]]s depends upon the [[frequency]] of [[light]] incident upon a [[metal]]'s surface. Below the [[Threshold Frequency|threshold frequency]] there are no [[photoelectrons]] emitted. | : The emission of [[photoelectron]]s depends upon the [[frequency]] of [[light]] incident upon a [[metal]]'s surface. Below the [[Threshold Frequency|threshold frequency]] there are no [[photoelectrons]] emitted. | ||
| − | : Below the [[Threshold Frequency|threshold | + | : Below the [[Threshold Frequency|threshold frequency]] the intensity of the [[light]] has no effect on the emission of [[photoelectron]]s (none are emitted). However, above the [[Threshold Frequency|threshold frequency]] an increase in the intensity of [[light]] will increase the number of [[photoelectron]]s emitted, but will not affect their maximum [[Kinetic Energy|kinetic energy]]. |
Latest revision as of 18:55, 23 January 2021
Contents
Key Stage 3
Meaning
A photoelectric effect is when light causes an electrical current.
About the Photoelectric Effect
- Light transfers energy which can be absorbed by a material causing electrons to gain energy and move.
- The photoelectric effect is used in digital cameras to make a picture. The light is focused through a lens onto a detector which generates an electrical current depending on the intensity of light.
Key Stage 4
Meaning
A photoelectric effect is when light causes an electrical current.
About the Photoelectric Effect
- Light transfers energy which can be absorbed by a material causing electrons to gain energy and move.
- The photoelectric effect is used in digital cameras to make a picture. The light is focused through a lens onto a detector which generates an electrical current depending on the intensity of light.
Key Stage 5
Meaning
A photoelectric effect is a phenomenon in which electrons are emitted form the surface of a metal when light of a minimum 'threshold' frequency is incident upon its surface.
About the Photoelectric Effect
- The Photoelectric Effect is proof of the photon model of light.
- The emission of photoelectrons depends upon the frequency of light incident upon a metal's surface. Below the threshold frequency there are no photoelectrons emitted.
- Below the threshold frequency the intensity of the light has no effect on the emission of photoelectrons (none are emitted). However, above the threshold frequency an increase in the intensity of light will increase the number of photoelectrons emitted, but will not affect their maximum kinetic energy.