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Geremia
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Is there an experiment that uses photons or other particles to measure the effect of Earth's rotation on them? Thanks
Not just photons but other particles, too, yesDr Lots-o'watts said:Is that an indirect way to ask if photon experiences the Coriolis force?
No, this is good.Dr Lots-o'watts said:Worded differently:
Suppose a beam of photons is emitted from the north pole, tangentially to the Earth's surface (so as to maximize a hypothetical Coriolis effect), will it follow the same trajectory as a beam of electrons emitted in the same direction (assuming no atmosphere)?
A mathematical (in)validation of this would also be interesting.
(hoping I'm not to far off your intended topic)
This line of reasoning doesn't work. Remember, if something is massless then it doesn't require any force to accelerate it. I.e. by Newton's 2nd law a=f/m=0/0 which is undefined, not zero.Dr Lots-o'watts said:As for a mathematical proof that it doesn't affect a photon, it suffices to say that Fcoriolis as classically defined is proportional to the mass of the particle, which for a photon is zero, so Fcoriolis(photon) = 0, QED. If any corresponding effect can be calculated with GR, it is beyond my personnal scope.
Okay, then let's work with, e.g., atoms of noble gases.DaleSpam said:This line of reasoning doesn't work. Remember, if something is massless then it doesn't require any force to accelerate it.
Geremia said:Is there an experiment that uses photons or other particles to measure the effect of Earth's rotation on them? Thanks
Cleonis said:... in ballistics it is pointless to take rotation of Earth effects into account; you won't be able to tell the difference anyway.
The Coriolis effects became important in external ballistics for calculating the trajectories of very long-range artillery shells. The most famous historical example was the Paris gun, used by the Germans during World War I to bombard Paris from a range of about 120 km (75 mi).
dlgoff said:http://en.wikipedia.org/wiki/Coriolis_effectThe Coriolis effects became important in external ballistics for calculating the trajectories of very long-range artillery shells. The most famous historical example was the Paris gun, used by the Germans during World War I to bombard Paris from a range of about 120 km (75 mi).
bolding by me.Cleonis said:This talk about ballistics is off-topic. I am as much to blame, I mentioned ballistics when I wanted to illustrate that in all kinds of cases the Earth rotation effect is indiscernible.
For small arms, the Coriolis effect is generally insignificant, but for ballistic projectiles with long flight times, such as extreme long-range rifle projectiles, artillery and intercontinental ballistic missiles, it is a significant factor in calculating the trajectory.
Geremia said:Okay, then let's work with, e.g., atoms of noble gases.
dlgoff said:
The Coriolis force is a phenomenon that occurs due to the Earth's rotation. It causes objects in motion on the Earth's surface to appear to veer to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
The Coriolis force can be detected optically by using a laser beam and a rotating platform. As the platform rotates, the laser beam appears to curve due to the Coriolis force, which can be measured using a high-precision detector.
Optical detection of the Coriolis force allows for a non-intrusive and accurate measurement of the Earth's rotation. This information can be used in various fields such as meteorology, geology, and oceanography to better understand the Earth's dynamics.
The Coriolis force is directly proportional to the Earth's rotation rate. As the Earth rotates faster near the equator and slower near the poles, the Coriolis force also varies in strength accordingly.
Yes, the Coriolis force can be detected in other planets with a rotating surface. However, the magnitude and direction of the force may differ from that on Earth depending on the planet's rotation rate and direction.