Dopler Effect

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Carantoc
Carantoc
WA
7285 posts
WA, 7285 posts
9 Feb 2010 5:04pm
Is it the Dopler effect that makes things along way away appear green, but change to yellow as they approach you and turn red just as they reach you ?

shear tip
shear tip
NSW
1125 posts
NSW, 1125 posts
9 Feb 2010 8:12pm
No. You're thinking of beer.
NotWal
NotWal
QLD
7436 posts
QLD, 7436 posts
9 Feb 2010 7:12pm
No.
shear tip
shear tip
NSW
1125 posts
NSW, 1125 posts
9 Feb 2010 8:13pm
SNAP!
swoosh
swoosh
QLD
1929 posts
QLD, 1929 posts
9 Feb 2010 7:21pm
i think he means traffic lights actually...
DavMen
DavMen
NSW
1510 posts
NSW, 1510 posts
9 Feb 2010 9:37pm
Wet Willy
Wet Willy
TAS
2317 posts
TAS, 2317 posts
9 Feb 2010 10:28pm
Wow. I'm amazed.

I just learnt more in 2 minutes on Seabreeze than I've learned in the past 10 years (not including windsurfing)...

I have some questions, if you wouldn't mind answering them, preferably with a simple, amusing video:

1-why is the sky blue?
2-why do wheels go round and round?
3-why does ice stay cold, and why does it melt?
4-at any one time, roughly what proportion of the ocean consists of fish poo?
5-how does electricity make gadgets and stuff work? How come they don't just, I dunno, work?
6-how come there's so much I don't understand?
7-is time travel possible?
8-why do we need sleep?
9-why can't people eat grass? I mean, eat grass exclusively, and survive? Or, if we can, why don't we?
10-sometimes I can't tell the difference between chicken, beef and pork. Can you please explain the difference, so I will know what to look out for?

Thanks in advance
shear tip
shear tip
NSW
1125 posts
NSW, 1125 posts
9 Feb 2010 10:37pm
Carantoc said...

Is it the Dopler effect that makes things along way away appear green, but change to yellow as they approach you and turn red just as they reach you ?


OK. So we've all missed the point. It's the Seabreeze effect. 7 days away the arrows are green. As we get closer to the weekend, the arrows turn yellow then red.
Mobydisc
Mobydisc
NSW
9029 posts
NSW, 9029 posts
9 Feb 2010 10:53pm
shear tip said...

Carantoc said...

Is it the Dopler effect that makes things along way away appear green, but change to yellow as they approach you and turn red just as they reach you ?


OK. So we've all missed the point. It's the Seabreeze effect. 7 days away the arrows are green. As we get closer to the weekend, the arrows turn yellow then red.


Though sometimes you get the anti-dopler effect here. There are red arrows on your screen but its windy outside.

JayBee
JayBee
NSW
714 posts
NSW, 714 posts
9 Feb 2010 10:55pm
Wet Willy said...


1-why is the sky blue? Because the sea is green.
2-why do wheels go round and round? Only bus wheels go round and round.
3-why does ice stay cold, and why does it melt? It learned from an ex girlfriend of mine, she melted too (when I poured a bucket of water over the wicked witch of the west).
4-at any one time, roughly what proportion of the ocean consists of fish poo?
5-how does electricity make gadgets and stuff work? How come they don't just, I dunno, work? Apathy, probably.
6-how come there's so much I don't understand?
7-YES is time travel possible?
8-why do we need sleep?
9-why can't people eat grass? I mean, eat grass exclusively, and survive? Or, if we can, why don't we? We can smoke it though.
10-sometimes I can't tell the difference between chicken, beef and pork. Can you please explain the difference, so I will know what to look out for? Feathers, Leather and YUMMY

Thanks in advance


DavMen
DavMen
NSW
1510 posts
NSW, 1510 posts
9 Feb 2010 11:02pm

Though sometimes you get the anti-dopler effect here. There are red arrows on your screen but its windy outside.


That must have been because the wind was blowing away from us not towards us
porka
porka
WA
160 posts
WA, 160 posts
10 Feb 2010 12:44pm
Wet Willy said...

Wow. I'm amazed.

I just learnt more in 2 minutes on Seabreeze than I've learned in the past 10 years (not including windsurfing)...

I have some questions, if you wouldn't mind answering them, preferably with a simple, amusing video:

1-why is the sky blue? Air molecules are agitated by light at the same frequency as the colour blue
2-why do wheels go round and round? They are rolling their eyes at stupid questions
3-why does ice stay cold, and why does it melt? Something to do with triple point phase transition
4-at any one time, roughly what proportion of the ocean consists of fish poo? 0% - Fish secretly poo on land in retaliation of us pooing in the ocean
5-how does electricity make gadgets and stuff work? How come they don't just, I dunno, work? Electricity = Ether = Synchronisity
6-how come there's so much I don't understand? Reading Seabreeze Kite forums has liquified your brain
7-is time travel possible? I'll tell you yesterday
8-why do we need sleep? As a break from pretending to work whilst talking poo on seabreeze
9-why can't people eat grass? I mean, eat grass exclusively, and survive? Or, if we can, why don't we? Dog's wee is very bitter
10-sometimes I can't tell the difference between chicken, beef and pork. Can you please explain the difference, so I will know what to look out for? In Singapore Chicken=Beef=Pork=Dog. If in Australia look for the IGA packaging

Thanks in advance


Little Jon
Little Jon
NSW
2115 posts
NSW, 2115 posts
10 Feb 2010 9:50pm
Doppler can change the light colur but you need to be close to the speed of light for this to work.

The sky is blue due to the refraction of light through the atmosphere,
Carantoc
Carantoc
WA
7285 posts
WA, 7285 posts
11 Feb 2010 9:32am
OK, I hear what you are all saying, but none of this explains why, on the east coast those little green things go yellow, then red the closer they get to you, but the west coast they used to stay green all summer.

It must have something to do with both the Dopler and the Coreolis, with a bit of second law thermo dynamics mixed in.

I am not looking for the pure physics explaination, I just need to know how to roughly estimate when the green things may go yellow then red and when they may stay green.

Hang on - I just thought, maybe my computer screen is broken and the right hand side only has green pixels, whilst the left hand side only has red pixels and the middle a few green and a few red.

Bugger - I think I just missed 3 months of wind. Maybe if turned my screen upside down I would sail more, and it might be cross-off not cross-on as well.

Why didn't I think of this before ? it is a brilliant plan. Just brilliant.
Carantoc
Carantoc
WA
7285 posts
WA, 7285 posts
11 Feb 2010 9:34am
gnihtyna daer t'nac I won ,revo neercs eht denrut , regguB
DavMen
DavMen
NSW
1510 posts
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