All Questions
29
questions
0
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0
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32
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What is the speed of light during reflection? [duplicate]
What is the speed of light in a vacuum when the light reflects off of a mirror?
- 331
3
votes
1
answer
109
views
How is it possible that photons already move at the speed of light the moment they pop into existence? [duplicate]
This is a thought experiment and I might be horribly wrong. If we have an electron-positron annihilation a photon pops into existence. This photon is then supposedly moving at speed of light at the ...
-1
votes
1
answer
47
views
Does photons accelerate from $0$ to $c$? [duplicate]
I recall that whenever an electron in a higher-than-normal orbit falls back to its normal orbit and produces photon. So shouldn't the photon accelerate from 0?
1
vote
2
answers
92
views
Does Proca's hypothesis make sense of giving mass to the photon in reference to special relativity?
The Romanian physicist Proca formulated his famous Lagrangian to describe a hypothetical massive photon. From it we derive, as equations of motion, the relations that the electric and magnetic fields ...
- 11
1
vote
1
answer
283
views
Are the photons in a standing wave moving at $c$?
So, in a standing wave, two superimposed waves produce a wave that remains stationary, with its particles resonating back and forth, right? For instance, in a water wave, two waves moving in opposite ...
- 1,309
0
votes
1
answer
82
views
Can we slowdown speed of photons? [closed]
Can we slowdown speed of photons or light? If we slowdown the speed of photon can photon give us mass?
-2
votes
4
answers
130
views
Photons confuse me [duplicate]
I'm not entirely sure if my question is valid or not but I'll ask it anyway. So my physics porf. told us the Photons are constantly in motion and they never come at rest and the sub-topics relating to ...
0
votes
4
answers
607
views
Why does the speed of light in vacuum never change? [duplicate]
why does the speed of light in vacuum never change? Under any circumstances, The speed of light in vacuum never change, why?
- 57
1
vote
2
answers
64
views
How does the speed of light affect our cosmic observations/detections?
-I learned that if you look at a star 10 million lightyears away, the light that you are looking at is 10 million years old since the photons have been traveling at the speed of light for 10 million ...
- 51
1
vote
6
answers
192
views
Is 'photons being massless' the reason everyone observes their speed to be the same?
When a man on a train throws a ball, the resultant velocity of the ball (as seen from ground) is the sum of the velocity of the train and the velocity imparted to the ball from the throw.
However, if ...
- 6,355
3
votes
2
answers
136
views
Can light go slower? [duplicate]
In a vacuum, are photons always traveling at 100% light speed? Can photons go any slower in a vacuum? They have no mass which means they can go at 100% light speed, but do they have to?
7
votes
3
answers
349
views
Are photons "born" travelling at the speed of light? In what manner do they propagate through space? [closed]
When an electron jumps from a high to a lower energy level and a photon is created, can the photon be detected from all vantage points or only from a discrete position?
Does the atom nucleus cast a ...
- 171
-2
votes
1
answer
80
views
Photon speed is it the same as light speed? [closed]
The speed of light is about 186000miles per sec. however, the light is also a wave. If the photon follows the wave path, then to progress at 186000miles / sec. in a linear direction must be ...
18
votes
5
answers
8k
views
Do Maxwell's equations predict the speed of light exactly?
I know that $\frac{1}{\sqrt{\mu_0\varepsilon_0}}$ is equal to the speed of light but is this prediction accurate? I mean is it 100 percent accurate?
- 1,278
0
votes
3
answers
122
views
Is it possible to get steady photon?
When light travels from low density medium to high density medium it's speed decreases according to refractive index of medium.
And light is made of moving photons .
That means photons are slow downed....
