Editing Talk:2926: Doppler Effect

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In the UK, the primary emergency-vehicle (police, ambulance/paramedic, fire, coastguard, anything else {{w|Emergency vehicle equipment in the United Kingdom|similarly official}}; for road/off-road/air/water vehicles of all kinds) flashing light tends to be blue. There may be alternating reds too, according to vintage, but currently blue lights are the main feature (and 'battenburgs', on marked vehicles, according to the nature of the service involved). Non-emergency vehicles' 'beacons' would be amber, on anything underspeed/stopped/extraordinary on the carriageway (road-sweepers, flatbed car-recovery, exceptional load carriers/escorts) and I think green and red flashers are common for construction site traffic. Interestingly, the other day I saw a police car ''and'' an unmarked response car (going to the same incident, both flashing their blues), three ambulances (none obviously going to same incident, and only two with blues) and a fire-engine (not flashing, probably going back to base). Only one of them (an ambulance) was blaring its respective siren, though. I believe emergency drivers are required to use them sparingly/judiciously, rather than just put the blues'n'twos on and barge through. [[Special:Contributions/172.70.90.172|172.70.90.172]] 21:06, 29 April 2024 (UTC)
 
In the UK, the primary emergency-vehicle (police, ambulance/paramedic, fire, coastguard, anything else {{w|Emergency vehicle equipment in the United Kingdom|similarly official}}; for road/off-road/air/water vehicles of all kinds) flashing light tends to be blue. There may be alternating reds too, according to vintage, but currently blue lights are the main feature (and 'battenburgs', on marked vehicles, according to the nature of the service involved). Non-emergency vehicles' 'beacons' would be amber, on anything underspeed/stopped/extraordinary on the carriageway (road-sweepers, flatbed car-recovery, exceptional load carriers/escorts) and I think green and red flashers are common for construction site traffic. Interestingly, the other day I saw a police car ''and'' an unmarked response car (going to the same incident, both flashing their blues), three ambulances (none obviously going to same incident, and only two with blues) and a fire-engine (not flashing, probably going back to base). Only one of them (an ambulance) was blaring its respective siren, though. I believe emergency drivers are required to use them sparingly/judiciously, rather than just put the blues'n'twos on and barge through. [[Special:Contributions/172.70.90.172|172.70.90.172]] 21:06, 29 April 2024 (UTC)
 
:Blue lights are actually common in most of Europe: https://en.wikipedia.org/wiki/Emergency_vehicle_lighting#Usage_by_country. The light of emergency vehicles is technically also effected by the Doppler Effect, though this is barely measurable at typical driving speeds. --[[Special:Contributions/172.71.160.32|172.71.160.32]] 09:36, 30 April 2024 (UTC)
 
:Blue lights are actually common in most of Europe: https://en.wikipedia.org/wiki/Emergency_vehicle_lighting#Usage_by_country. The light of emergency vehicles is technically also effected by the Doppler Effect, though this is barely measurable at typical driving speeds. --[[Special:Contributions/172.71.160.32|172.71.160.32]] 09:36, 30 April 2024 (UTC)
::Yes also in Denmark they use blue lights. Red light are all around already, so not so good using that to make a difference. Typical US :-p --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 11:43, 30 April 2024 (UTC)
 
  
 
It appears to be sheer coincidence that sirens were relevant to the discussion, as Miss Lenhart does not actually seem to know that the same phenomenon is at work. --[[Special:Contributions/172.70.211.129|172.70.211.129]] 22:04, 29 April 2024 (UTC)
 
It appears to be sheer coincidence that sirens were relevant to the discussion, as Miss Lenhart does not actually seem to know that the same phenomenon is at work. --[[Special:Contributions/172.70.211.129|172.70.211.129]] 22:04, 29 April 2024 (UTC)
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re: "Pew pew" still unexplained. Note that Miss Lenhart actually says "pyeew" not "pew". It's most likely not a reference to shooting, but to a siren signal that (to my knowledge) is particular to US ambulances. Sound effect in question at ~0:18 [https://www.youtube.com/watch?v=s5bwBS27A1g here]. [[Special:Contributions/172.70.46.241|172.70.46.241]] 07:52, 30 April 2024 (UTC)
 
re: "Pew pew" still unexplained. Note that Miss Lenhart actually says "pyeew" not "pew". It's most likely not a reference to shooting, but to a siren signal that (to my knowledge) is particular to US ambulances. Sound effect in question at ~0:18 [https://www.youtube.com/watch?v=s5bwBS27A1g here]. [[Special:Contributions/172.70.46.241|172.70.46.241]] 07:52, 30 April 2024 (UTC)
 
This comic has no colors... But the title text makes note of using a colored emoji... Are we agreeing that the comic should still not be listed as one using colors? (I think that should be restricted to the main comic). --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 11:44, 30 April 2024 (UTC)
 
 
With recent new discoveries by James Webb Space Telescope of very old galaxies that shouldn't have time to form, the theory of tired light is making a comeback. It's still far from mainstream, but Miss Lenhart can actually be on to something when she states we don't know why the redshift. {{unsigned ip|162.158.110.193|12:11, 30 April 2024}}
 

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