Timeline for How do I measure speed accurately without any turning wheels?
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 14, 2017 at 20:00 | comment | added | Bill N | Tell me specifically what's wrong. The Doppler shift equation of EM waves is different from the Doppler shift of sound. That's due to the fixed speed of light in any reference frame. That's special relativity. | |
| Feb 14, 2017 at 19:41 | comment | added | Georg | repeating something wrong does not improve anything. Read about "relativity" | |
| Feb 9, 2017 at 3:04 | comment | added | Bill N | What do you mean? The Doppler effect on radar and light is a relativistic effect. The radar computer, however, is a superheterodyne transceiver which produces a beat frequency between the transmitted and received wave. The beat frequency is used to calculate the speed of the detected vehicle, and it absolutely must use the relativistic shift equation to calculate the speed. | |
| Feb 8, 2017 at 12:26 | comment | added | Georg | There is no "relativiy" in polices radar apparatus. | |
| Dec 17, 2016 at 23:17 | history | answered | Bill N | CC BY-SA 3.0 |