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  1. Naked Science Forum
  2. On the Lighter Side
  3. That CAN'T be true!
  4. LIGO represents an mirror displacement of what?
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LIGO represents an mirror displacement of what?

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Offline alancalverd

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Re: LIGO represents an mirror displacement of what?
« Reply #100 on: 13/05/2019 13:21:38 »
Not a good idea to go to Hawaii since that will involve either a plane or a boat, designed by an engineer who hadn't seen it before and therefore had no idea what maths to use.
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Offline alright1234 (OP)

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Re: LIGO represents an mirror displacement of what?
« Reply #101 on: 23/05/2019 00:17:18 »
The 10^-18 m mirror displacement is three order less than the diameter of an electron!
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Re: LIGO represents an mirror displacement of what?
« Reply #102 on: 23/05/2019 16:58:28 »
Quote from: alright1234 on 23/05/2019 00:17:18
The 10^-18 m mirror displacement is three order less than the diameter of an electron!

No it isn't. The upper limit of the electron radius as determined from a Penning trap is around 10-22 meters: https://iopscience.iop.org/article/10.1088/0031-8949/1988/T22/016/meta
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Offline Bored chemist

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Re: LIGO represents an mirror displacement of what?
« Reply #103 on: 23/05/2019 19:28:18 »
Quote from: alright1234 on 23/05/2019 00:17:18
The 10^-18 m mirror displacement is three order less than the diameter of an electron!
No it isn't.
But even if it was, why would it matter?
We aren't trying to measure the electron.
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Offline Bored chemist

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Re: LIGO represents an mirror displacement of what?
« Reply #104 on: 23/05/2019 19:31:14 »
Quote from: alright1234 on 20/04/2019 00:30:30
since the mirror displacement of ΔL = 10-18 m is less than the diameter of an electrons which is to small of a displacement to experimentally measure.
Do you remember now?
It was not true when you said it the first time.
Saying it again makes you look silly
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Offline alright1234 (OP)

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Re: LIGO represents an mirror displacement of what?
« Reply #105 on: 23/05/2019 23:36:13 »
Quote from: Kryptid on 23/05/2019 16:58:28
Quote from: alright1234 on 23/05/2019 00:17:18
The 10^-18 m mirror displacement is three order less than the diameter of an electron!

No it isn't. The upper limit of the electron radius as determined from a Penning trap is around 10-22 meters: https://iopscience.iop.org/article/10.1088/0031-8949/1988/T22/016/meta

The Penning trap is based on a cyclotron that uses a proton beam. How do you produce a proton beam and protons exist.
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Re: LIGO represents an mirror displacement of what?
« Reply #106 on: 24/05/2019 00:18:50 »
Quote from: alright1234 on 23/05/2019 23:36:13
How do you produce a proton beam and protons exist.

This explains how: https://protons.com/proton-advantage/how-does-proton-therapy-work
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Re: LIGO represents an mirror displacement of what?
« Reply #107 on: 24/05/2019 07:31:30 »
Quote from: alright1234 on 23/05/2019 23:36:13
The Penning trap is based on a cyclotron that uses a proton beam
The traps used for looking at electrons use electron beams...
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Offline particlephysics

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Re: LIGO represents an mirror displacement of what?
« Reply #108 on: 10/09/2019 20:27:09 »
The LIGO states that a 10^18 m displacement is measured but how can this displacement be measured?  Also, Geiger counters only detect gamma rays---- right, since alpha particles cannot propagate through glass that has the mass close to a helium atom.
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Re: LIGO represents an mirror displacement of what?
« Reply #109 on: 10/09/2019 20:42:49 »
Quote from: particlephysics on 10/09/2019 20:27:09
The LIGO states that a 10^18 m displacement is measured but how can this displacement be measured?
By interferometry.
You can find out more by looking at the sort of web page that tells you that the displacement is 10^-18m
(I'm assuming the missing  minus sign in your post is a typo)


Quote from: particlephysics on 10/09/2019 20:27:09
Geiger counters only detect gamma rays---- right, since alpha particles cannot propagate through glass that has the mass close to a helium atom.
No
Geiger counters aren't very good at spotting gammas- gammas tend to go straight through them without stopping.
You can make alpha sensing Geigers- you just need a very thin wall or window.
Thin sheets of mica are one option.
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