How can we said that photon does not have a mass?

In summary, the claim that photons do not have mass is supported by various pieces of evidence. One key piece is that photons travel at the speed of light, which is not possible for objects with mass according to Einstein's theory of relativity. While photons do have energy, it is not equivalent to mass. The Higgs field is responsible for giving particles their mass, but photons do not interact with this field. There have also been numerous experiments that directly measure the mass of photons and have found it to be zero. According to current understanding, photons cannot gain mass under any circumstances, although some theories suggest they may have had a small amount of mass in the past.
  • #1
80
0
how can we sad that photon does not have a mass? in my book they are a piece that there write at the photon influence of gravitation?
 
Physics news on Phys.org
  • #2
aloshi said:
how can we sad that photon does not have a mass? in my book they are a piece that there write at the photon influence of gravitation?

Hi aloshi! :smile:

Mass is energy, energy is mass.

A photon does not have rest-mass, but it does have mass.

A box into which photons are inserted (from outside) weighs more, and exerts more gravity.
 

What is the evidence that supports the claim that photons do not have mass?

One of the main pieces of evidence is the fact that photons travel at the speed of light, which is a fundamental constant in the universe. According to Einstein's theory of relativity, objects with mass cannot reach the speed of light. Therefore, the fact that photons travel at this speed suggests that they do not have mass.

How do we know that photons have no mass when they clearly have energy?

While photons do have energy, this energy is not equivalent to mass. Photons are considered to be massless because they do not have a rest mass, which is the mass an object has when it is not moving. The energy of a photon comes from its momentum and frequency, not from its mass.

What role does the Higgs field play in the mass of particles?

The Higgs field is responsible for giving particles their mass through a process known as the Higgs mechanism. However, this only applies to particles that interact with the Higgs field, such as the W and Z bosons. Photons do not interact with the Higgs field, which is why they do not acquire mass from it.

Is there any experimental evidence that directly proves that photons have no mass?

Yes, there have been numerous experiments that have directly measured the mass of photons and have found it to be zero. One of the most famous examples is the Michelson-Morley experiment, which showed that the speed of light is the same in all directions, regardless of the direction of the Earth's motion. This would not be possible if photons had mass.

Can photons ever gain mass under certain conditions?

According to current scientific understanding, photons cannot gain mass under any circumstances. However, there are some theories that suggest that in certain extreme conditions, such as in the early universe, photons may have had a small amount of mass. However, this is still a topic of debate and has not been confirmed by any experimental evidence.

Suggested for: How can we said that photon does not have a mass?

Replies
4
Views
196
Replies
11
Views
605
Replies
5
Views
877
Replies
1
Views
713
Replies
1
Views
639
Replies
3
Views
174
Replies
7
Views
1K
Replies
2
Views
863
Back
Top