What is Rest Mass? Explaining Photon Mass Zero

imran
Messages
17
Reaction score
0
what is rest mass? why does a photon have rest mass zero? :rolleyes:
 
Physics news on Phys.org
Rest mass is the mass an object has when you are in its frame of refrence (IE its stationary to you). Photons have rest mass zero because they dont have any mass :)
 
thank q for ur ans
 

Thread 'Importance of Hanbury Brown and Twiss experiment'

I read Hanbury Brown and Twiss's experiment is using one beam but split into two to test their correlation. It said the traditional correlation test were using two beams........ This confused me, sorry. All the correlation tests I learnt such as Stern-Gerlash are using one beam? (Sorry if I am wrong) I was also told traditional interferometers are concerning about amplitude but Hanbury Brown and Twiss were concerning about intensity? Isn't the square of amplitude is the intensity? Please...
View full post »

Thread 'Prof Mike Wiest's proposed link between quantum and consciousness'

I am not sure if this belongs in the biology section, but it appears more of a quantum physics question. Mike Wiest, Associate Professor of Neuroscience at Wellesley College in the US. In 2024 he published the results of an experiment on anaesthesia which purported to point to a role of quantum processes in consciousness; here is a popular exposition: https://neurosciencenews.com/quantum-process-consciousness-27624/ As my expertise in neuroscience doesn't reach up to an ant's ear...
View full post »

Thread 'Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
View full post »

Similar threads

A Coleman: "Spin is a concept that applies only to particles with mass"
Replies
11
Views
1K
B Photon Energy Without Rest Mass – How?
Replies
19
Views
2K
Photon rest mass = 0 wasn't proven experimentally?
Replies
15
Views
2K
I Single Photon States: Definition & Real-Life Applications
Replies
32
Views
2K
I The claymath 4-d QFT problem and virtual particles (as an example)
Replies
36
Views
3K
I Dirac's Rest Mass in Minowski Spacetime
Replies
4
Views
1K
I Mass of Electron & Flipping Frequency: Leonard Susskind Explains
Replies
1
Views
1K
I Use of polarization to experimentally check photon mass?
Replies
1
Views
1K
I What is (rest) mass for a particle?
Replies
3
Views
2K
HUP and Rest Mass of Electrons
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top