Photon Momentum: How Can It Exist With No Mass?

In summary, the conversation discusses the concept of a photon and its properties, specifically its mass and momentum. It is explained that a photon is not a classical particle and resources are provided for further understanding. The conversation ends with the acknowledgement that the lack of knowledge was the reason for confusion.
  • #1
nealh149
111
0
If a photon is theoretically zero mass, how can it have any momentum at all?

I may just be missing some knowledge.
 
Physics news on Phys.org
  • #4
Thanks a lot guys, I understand it now. Seems it was just a lack of knowledge on my part.
 

1. What is photon momentum?

Photon momentum is the measure of the amount of momentum a photon has when it is in motion. It is a fundamental property of a photon that describes its motion and behavior.

2. How can something with no mass have momentum?

According to Einstein's theory of relativity, mass and energy are interchangeable. Photons have energy due to their electromagnetic radiation, and this energy can be quantified as momentum. While photons have no rest mass, they do have relativistic mass and can transfer momentum when they interact with other particles.

3. How is photon momentum calculated?

The momentum of a photon can be calculated using the equation p = h/λ, where p is the momentum, h is Planck's constant, and λ is the wavelength of the photon. This equation shows that the momentum of a photon is directly proportional to its frequency and inversely proportional to its wavelength.

4. Can photon momentum be observed?

Yes, photon momentum has been observed and measured in various experiments, such as the Compton effect and photon pressure experiments. These experiments demonstrate that photons do have momentum and can transfer it to other particles.

5. What are the practical applications of understanding photon momentum?

Understanding photon momentum is crucial in many fields, such as optics and photonics. It helps in the development of technologies, such as lasers and solar cells, and in understanding the behavior of light in different environments. Additionally, the concept of photon momentum is essential in quantum mechanics and particle physics, contributing to our understanding of the fundamental laws of the universe.

Similar threads

Replies
5
Views
951
Replies
3
Views
933
Replies
3
Views
1K
Replies
30
Views
1K
Replies
4
Views
840
Replies
3
Views
1K
  • Special and General Relativity
Replies
19
Views
1K
Replies
4
Views
978
Replies
25
Views
2K
Back
Top