Tagged Questions
0
votes
2answers
62 views
Special Theory of relativity on electromagnetic waves
Since time slows down and length contracts, when we travel almost at speed of light, if the speed of light (or EM waves) remains same and the wavelength of light remains same, do we measure the ...
9
votes
4answers
573 views
Why does the speed of light $c$ have the value it does?
Why does light have the speed it does? why is it not considerably faster or slower than it is? I can't imagine science, being what it is, not pursuing a rational scientific explanation for the speed ...
1
vote
2answers
98 views
Can the speed of an electromagnetic wave be measured in the absence of neutrinos?
Let me explain better: from what I understand neutrinos are so pervasive they are literally everywhere. And since they have such a tiny electric charge they barely interact with anything and cannot be ...
2
votes
3answers
159 views
Difference in velocity of light in change in medium
It is often seen that according to physics the light changes it's velocity according to the medium through which it is traveling. So can it be explained that why so happen?
3
votes
1answer
159 views
Does $\lambda\nu = c$ hold for all the waves in the universe?
Are all waves in the universe the same as electromagnetic waves?
Basically, my question arises from an equation I found in my chemistry textbook:
$$\lambda \nu ~=~ c.$$
This states that the ...
1
vote
0answers
244 views
What happens with photon when it is slowed down substantially?
In a dispersive media light's velocity can change substantially. Imagine we can slow it down to near 0 what the wave would look like?
Frequency of light does not seem to change even at v=0 (at least ...
0
votes
3answers
272 views
Why do photons travel?
Photons travel at the speed of light.
Is there a known explanation of this phenomenon, and if yes, what is it?
Edit:
To be clearer, my question is why do photons travel at all. Why do they have a ...
2
votes
2answers
408 views
Is all kind of light same speed?
Is there any speed different between blue or red color? Is there speed different? or there are same speed?
1
vote
2answers
51 views
Does the efficiency of radiation change in any way in the presence of a medium?
I've read that radiation doesn't really require a medium. But if you're taking, for example, the sun's light, then does its efficiency of transmission increase or decrease once it reaches the earth's ...
4
votes
2answers
12k views
Why does wavelength change as light enters a different medium?
When light waves enter a medium of higher refractive index than the previous, why is it that:
Its wavelength decreases?
The frequency of it has to stay the same?
2
votes
3answers
476 views
Can a photon be emitted with a wavelength > 299,792,458 meters, and would this violate c?
Just curious if the possibility exists (not necessarily spontaneously) for a photon with a wavelength greater than the distance component of c to be emitted, and would this inherently violate the ...
0
votes
2answers
145 views
light travels a maximum speed… /? [duplicate]
Possible Duplicate:
Is it possible for information to be transmitted faster than light?
we know that speed of light is an unconquerable term in physics..light takes about 1 year to travel ...
0
votes
1answer
256 views
Speed of Light, Photons or WaveSpeed?
The speed of light is almost 300 000 km/s.
The photons have a speed along the wave, and the wave have a speed straight forwards.
What is the speed of light? Is it the speed the photons have along ...
5
votes
2answers
357 views
Do gravitational waves slow down as they pass through matter?
I've heard that gravitational waves travel at the speed of light, and have some parallels to electromagnetic waves. EM waves slow down as they pass through matter (speed of light in glass is slower ...
2
votes
2answers
862 views
Michelson rotating mirror experiment
Could someone explain the calculation required to answer this question. It is from a text book and the answer is recorded as 585Hz but I cannot replicate the answer.
In 1931 Michelson used a ...
1
vote
1answer
995 views
Can you see yourself in a mirror when you are riding on top of a light stream?
What happens if you would ride on top of a light stream and you would look into a mirror that is in front of you, could you actually see your own face? I am asking this because I heard that nothing ...
3
votes
2answers
1k views
How is the speed of light calculated?
How is the speed of light calculated? My knowledge of physics is limited to how much I studied till high school. One way that comes to my mind is: if we throw light from one point to another (of known ...
3
votes
5answers
3k views
Why and how is the speed of light constant?
I was told that the relative speed rule does not apply to the speed of light. No matter how fast two objects are moving, the speed of light will remain same for both of them.
How and why is this ...
