What is the amplitude of light?

  • Context: High School 
  • Thread starter Thread starter Daniel Petka
  • Start date Start date
  • Tags Tags
    Amplitude Light Photons
Click For Summary

Discussion Overview

The discussion revolves around the concept of amplitude in light waves, specifically how it relates to frequency and photon energy. Participants explore the implications of amplitude in the context of light's properties and its measurement.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant asserts that light has both frequency and amplitude, linking frequency to photon energy and amplitude to the number of photons.
  • Another participant provides a formula relating frequency to energy, suggesting that knowing photon energy allows for the calculation of frequency.
  • A participant clarifies their inquiry by emphasizing the focus on amplitude rather than frequency.
  • One participant discusses the relationship between amplitude and the strength of electric and magnetic fields, providing specific intensity values and their corresponding peak field strengths.
  • A later post invites feedback on the approach of relating amplitude to electric and magnetic field strengths.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the definition or significance of amplitude in light, with multiple perspectives presented and no resolution on the initial question.

Contextual Notes

Some assumptions regarding the relationship between amplitude, intensity, and field strengths are not fully explored, and the discussion lacks a definitive framework for measuring amplitude in light.

Who May Find This Useful

Individuals interested in the properties of light, wave mechanics, and the relationship between amplitude, frequency, and energy in electromagnetic waves may find this discussion relevant.

Daniel Petka
Messages
147
Reaction score
16
Like every wave, light has a frequency and an amplitude. So far, I know that the frequency equals to the photon energy and the amplitude to the amount of photons. My question is: how big is that amplitude and does it matter?
Thanks for every reply :wink:
 
Physics news on Phys.org
frequency of the light can can be described as hν=E, SO FREQUENCY=E/h where h is joule s constant if we knw the photon energy
 
Thanks, vishal giri. I asked for the amplitude, though. The frequency is clear anyway...
 
You can look at the strength of electric and magnetic fields. As an example, an intensity of 1 kW/m2 for a planar wave corresponds to peak values of about 400 V/m and 1.4 microTesla, give or take numerical prefactors that I forgot.
 
  • Like
Likes   Reactions: bhobba

Similar threads

  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 8 ·
Replies
8
Views
683
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 18 ·
Replies
18
Views
2K
  • · Replies 64 ·
3
Replies
64
Views
6K