Intensity vs. Amplitude

$c=\lambda v$

Semi Yoon
Posts: 60
Joined: Fri Sep 28, 2018 12:27 am

Intensity vs. Amplitude

Is the intensity of photons related to the amplitude of a wave?

Iris Bai 2K
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am

Re: Intensity vs. Amplitude

A photon of light is a fixed amount for each electron in each element, so there is no change in intensity of a particular photon.

Joonsoo Kim 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

Re: Intensity vs. Amplitude

I believe there is no "intensity" of photons- instead, the intensity of a light source relates to the number of photons (i.e. an intense light would correspond to many more photons than a dim light). In the wave model, the intensity of a light relates to the amplitude of the wave (imagine waves at a beach- the higher the wave, the stronger it is).
This is why the photoelectric effect experiment disproved the wave model, since increasing the intensity of a dim light should technically eventually give the light enough energy to knock off an electron from a metal source, but it turned out that the energy of light was related to frequency, and not necessarily amplitude. If you can picture light as particles, increasing the frequency of those particles would be analogous to increasing their speed/kinetic energy, which is where the particle model of light came from.

Eunice Lee 1A
Posts: 60
Joined: Wed Oct 03, 2018 12:16 am

Re: Intensity vs. Amplitude

Light intensity is proportional to the number of protons. The more intense a light is, the more photons it has.

Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

Re: Intensity vs. Amplitude

The intensity of light in the wave model is associated with the amplitude of a wave because a higher amplitude correlates with higher intensity light. When thinking about light as a particle, the intensity of the light is based on the number of photons.

Kayla Vo 1B
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Intensity vs. Amplitude

In the wave model of electromagnetic radiation, intensity is proportional to the square of the amplitude. However, in the particle model, intensity is proportional to the number of photons present at an instant.