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Science & Technology Quiz 2: The one with the catchy title.
- Thread starter brennan
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Perfection
The Great Head.
OOOP'D
SAWWY SOWWY SOWWY
How long does it take for Earth to revolve around its axis?
SAWWY SOWWY SOWWY
How long does it take for Earth to revolve around its axis?
Simple Simon
Simpleton
from what reference system?
Mise
isle of lucy
23 hrs 56 mins IIRC
edit: that can't be right... must be 23 hrs 59 mins 56 secs.
edit: that can't be right... must be 23 hrs 59 mins 56 secs.
Perfection
The Great Head.
and yet it is! Since Mise disavows it though, we can't just end the contest there. Someone has to derive the value (or at least explain it).
A day is defined as the time it takes for the sun to be in the same place of the sky again. However this is a bit longer than the time it takes for the earth to revolve around is axis, as the earth revolves around the sun at the same time. This sums up to one extra revolution per year, that we don't notice. If we divide that one revolution by the 365 sun days in a year, we get the 4 minutes difference between a sun day and the time for one earth revolution.
Perfection
The Great Head.
Yeps. 
Perfection
The Great Head.
Yeps.
Perfection
The Great Head.
Yeps.
Perfection
The Great Head.
Nopes 
Mise
isle of lucy
Huh, that's really interesting... I shall have to wow my dinner party guests with that!
Zebra 9
Emperor
Cool, I always wanted to know how we could have a 24 hour clock on a planet that had 23 hours 56 minutes.
member66170
King
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Because in the case of clocks, 1 day is defined as a 360 degree rotation. However, in Astronomy a day is defined as the time it takes for the sun to appear twice in the same location. The two definitions defer by 4minutes
I dont' know, but I'm going to hazard a guess here...
The wavelength of the laser light is such that the target atoms are held by the troughs of the waves... the target has no space in which to vibrate, since it would have to gain energy to climb out of the trough; hence, it is cooled by the light.
The wavelength of the laser light is such that the target atoms are held by the troughs of the waves... the target has no space in which to vibrate, since it would have to gain energy to climb out of the trough; hence, it is cooled by the light.
I dont' know, but I'm going to hazard a guess here...
The wavelength of the laser light is such that the target atoms are held by the troughs of the waves... the target has no space in which to vibrate, since it would have to gain energy to climb out of the trough; hence, it is cooled by the light.
This wouldn't work for more than one reason. So, no.
Zebra 9
Emperor
Wild guess: 
The laser interferes with the particles movement causing it to move less reducing friction hence causing it to cool.
The laser interferes with the particles movement causing it to move less reducing friction hence causing it to cool.
Wild guess:
The laser interferes with the particles movement causing it to move less reducing friction hence causing it to cool.
Well, there shouldn't be any significant friction to begin with, if you want to make any progress with the cooling.
If you meant "interfere" in the physical sense (interfering waves) then you're wrong.
If you didn't, it is sort of right (if you strike the friction part), but that could be said about any cooling device. The interesting part is, how one can use laser light to cool the atoms and how the slowing down works.
Mise
isle of lucy
it's summat about the material absorbing the photon, which excites an electron to a higher energy level, but when the electron falls back down, it releases more energy than the photon it absorbed...
"Something" like that
"Something" like that
Perfection
The Great Head.
It works with lasers. 
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