Timeline for Why is the speed of light said to be constant when we know it slows down in a medium?
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 5, 2017 at 1:50 | comment | added | Bill Alsept | That's what I said the speed of light coming from Andromeda is constant but we are racing toward it at 250,000 mph. Therefore based on time we are shortening the wavelength which appears to be an increased frequency. | |
| Jan 5, 2017 at 1:48 | comment | added | hsinghal | @Bill Alsept you are right about blue shift. But speed of light coming from Andromeda is same as from anywhere else. | |
| Jan 5, 2017 at 1:45 | comment | added | Bill Alsept | The difference in speed is not constant. We are moving toward Andromeda at 250,000 miles Per hour. I know that is slow but that's enough to blueshift the light compared to other galaxies that we are not moving toward. The light coming from Andromeda has a constant speed but the speed at which we are meeting at increases and so does the frequency. | |
| Jan 5, 2017 at 1:39 | comment | added | hsinghal | @Bill Alsept This is not the case. Velocity remains constant the other two quantities change accordingly. Read about relativistic Doppler Effect | |
| Jan 4, 2017 at 19:14 | comment | added | Bill Alsept | Exactly, so if the speed is not constant you will get blue or red shift. Speed of light stays constant but the rate of change speeds up or slows down depending | |
| Jan 4, 2017 at 19:08 | comment | added | hsinghal | Frequency x wavelength = speed of wave. Frequency increases, wavelength decreases speed of light remains constant. | |
| Jan 4, 2017 at 19:03 | comment | added | Bill Alsept | How you perceive frequency is directly related to velocity and time | |
| Jan 4, 2017 at 18:28 | comment | added | hsinghal | @BillAlsept Blue shift due to Doppler effect changes frequency not the velocity of light. | |
| Jan 4, 2017 at 18:26 | comment | added | Bill Alsept | I'm not sure if that is true. They say Andromeda galaxy is blueshifted because we are moving toward it. | |
| Jan 4, 2017 at 18:22 | history | answered | hsinghal | CC BY-SA 3.0 |