| Topic: |
Science > Physics |
| User: |
"" |
| Date: |
20 Jul 2007 10:00:23 AM |
| Object: |
How constant is constant and speed of light? |
Measured light speeds:
Birge, 1929, 299.796 km/sec
Mittelstaedt, 1928, 299.778+-20
Michelson et al., 1932, 299.774+-11
Michelson et al., 1935, 299.774+-4
Anderson, 1937, 299.771+-10
Huttel, 1940, 299.771+-10
Anderson, 1941, 299.776+-6
Birge, 1941, 299.776+-4
Dorsey, 1945, 299.773+-10
Since 1972 the speed of light is DEFINED at 299.792.458+-0.001, NOT
measured. No effort to measure the speed will be made since then.
Moreover, the meter and second are both defined based on the speed of
light, so no change in the speed of light can be measured anymore!
So how constant is constant and if the speed of light is an
unbreakable barrier is it possible that we can move the barrier itself?
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| User: "Sam Wormley" |
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| Title: Re: How constant is constant and speed of light? |
20 Jul 2007 06:53:53 PM |
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wrote:
Measured light speeds:
Birge, 1929, 299.796 km/sec
Mittelstaedt, 1928, 299.778+-20
Michelson et al., 1932, 299.774+-11
Michelson et al., 1935, 299.774+-4
Anderson, 1937, 299.771+-10
Huttel, 1940, 299.771+-10
Anderson, 1941, 299.776+-6
Birge, 1941, 299.776+-4
Dorsey, 1945, 299.773+-10
Since 1972 the speed of light is DEFINED at 299.792.458+-0.001, NOT
measured. No effort to measure the speed will be made since then.
Moreover, the meter and second are both defined based on the speed of
light, so no change in the speed of light can be measured anymore!
So how constant is constant and if the speed of light is an
unbreakable barrier is it possible that we can move the barrier itself?
The speed of light is a *defined* constant.
http://scienceworld.wolfram.com/physics/SpeedofLight.html
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| User: "" |
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| Title: Re: How constant is constant and speed of light? |
21 Jul 2007 06:05:39 AM |
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On Jul 21, 2:53 am, Sam Wormley <sworml...@mchsi.com> wrote:
DDP3...@gmail.com wrote:
Measured light speeds:
Birge, 1929, 299.796 km/sec
Mittelstaedt, 1928, 299.778+-20
Michelson et al., 1932, 299.774+-11
Michelson et al., 1935, 299.774+-4
Anderson, 1937, 299.771+-10
Huttel, 1940, 299.771+-10
Anderson, 1941, 299.776+-6
Birge, 1941, 299.776+-4
Dorsey, 1945, 299.773+-10
Since 1972 the speed of light is DEFINED at 299.792.458+-0.001, NOT
measured. No effort to measure the speed will be made since then.
Moreover, the meter and second are both defined based on the speed of
light, so no change in the speed of light can be measured anymore!
So how constant is constant and if the speed of light is an
unbreakable barrier is it possible that we can move the barrier itself?
The speed of light is a *defined* constant.
http://scienceworld.wolfram.com/physics/SpeedofLight.html- Hide quoted text -
- Show quoted text -
Von Friesen, On the values of fundamental atomic constants and
Petly, The fundamental physical constants and the frontiers of
metrology
a bit more accurate than wikipedia and scienceworld, don't you think
so?
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| User: "Sue..." |
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| Title: Re: How constant is constant and speed of light? |
20 Jul 2007 03:37:08 PM |
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On Jul 20, 12:00 pm, wrote:
Measured light speeds:
Birge, 1929, 299.796 km/sec
Mittelstaedt, 1928, 299.778+-20
Michelson et al., 1932, 299.774+-11
Michelson et al., 1935, 299.774+-4
Anderson, 1937, 299.771+-10
Huttel, 1940, 299.771+-10
Anderson, 1941, 299.776+-6
Birge, 1941, 299.776+-4
Dorsey, 1945, 299.773+-10
Since 1972 the speed of light is DEFINED at 299.792.458+-0.001, NOT
measured. No effort to measure the speed will be made since then.
Moreover, the meter and second are both defined based on the speed of
light, so no change in the speed of light can be measured anymore!
So how constant is constant and if the speed of light is an
unbreakable barrier is it possible that we can move the barrier itself?
Replace all the electrons in the universe with lightweight
versions and the light should go faster.
http://farside.ph.utexas.edu/teaching/em/lectures/node98.html
http://en.wikipedia.org/wiki/Wave_impedance
http://en.wikipedia.org/wiki/Free_space
http://www-ssg.sr.unh.edu/ism/what.html
Sue...
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| User: "Satans cabana boy" |
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| Title: Re: How constant is constant and speed of light? |
20 Jul 2007 02:39:09 PM |
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Yipes. A google-poster with a gmail address.
<DDP3000@gmail.com> wrote in message
news:1184943623.670455.263630@n60g2000hse.googlegroups.com...
--
Posted via a free Usenet account from http://www.teranews.com
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