Tuesday, February 14. 2006
Roses are red...
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At the risk of identifying myself as even more of a geek than Pete, surely if the rose was coming towards you, the wave would be compressed, frequency would increase and hence wavelength would decrease, and therefore the rose would turn infra-red not blue.
Hence surely the rose should be "going away from you" instead?
Or is my understanding of Doppler somewhat flawed?
Dxx
Hence surely the rose should be "going away from you" instead?
Or is my understanding of Doppler somewhat flawed?
Dxx
Your understanding of the Doppler Effect is sound, but you're forgetting which way the spectrum goes. Wavelength increases from violet to red, not vice versa as you have said. So the rose will get bluer as it comes towards you. This is why they measure how fast stars are moving away based on their "red shift" and why you can get humorous bumper stickers that say things like "If my car looks blue, you're driving too fast."
Ah, geek humour. Doesn't it feel good?
Ah, geek humour. Doesn't it feel good?
Silly Duncs *rolls eyes*
Pete, that was thoroughly cringeworth, well done
Pete, that was thoroughly cringeworth, well done
You are, of course, correct. As my mother would say, "If brains were a disease, I'd be in the best of health."
Don't quite understand at what point I managed to turn the electromagnetic spectrum upside down... I am rather silly.
Trust you are both well. Dx
Don't quite understand at what point I managed to turn the electromagnetic spectrum upside down... I am rather silly.
Trust you are both well. Dx
Wow sadly i got the joke too but only because I had to re-learn red shift in order to teach it to my year 11 class before half term. Still I prefered my CD to blue roses, cheers Pete 
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