# Tag Info

0

Yes, Einstein definitely knew about the (lack of) results of the Michelson-Morley experiment. It is like asking whether Stephen Hawking knows that gravitational waves have not been directly detected yet. That was simply the most exciting experiment of the time(I believe even regular newspapers published the results). No one would try to revolutionize physics ...

6

Did he knew about the Michelson-Morley experiment? He just knew the name of the experiment not any details. The experiment didn't play any role in the formulation of STR by Albert Einstein. The context is taken from the book: Special Theory of Relativity by V. A.; Atanov, Yuri (Trans.) Ugarov (Author) Art: Was Michelson's experiment "decisive" for ...

0

To add to Stan Liou's point: No, it's not possible because we don't measure $\pi$ at all; rather, we define it in reference to Euclidean geometry, which is flat. However, Euclidean geometry probably has intuitive simplicity for humans because it closely matches the geometry of space in our environment. Here's one way of understanding explicitly what ...

8

I read about Goodwin's "proof" that π = 3.20... Its BS and I know that. What I am wondering is whether his technique may have stumbled on something ( a warped space) years before Einstein. In short, no. Slightly longer, noooo.... Notably, even if Goodwin made some coherent sense (and he did not), doing this before Einstein is not a significant ...

8

According to Wikipedia: In particle physics, the history of quantum field theory starts with its creation by Paul Dirac, when he attempted to quantize the electromagnetic field in the late 1920s. [My emphasis.] And according to Wikipedia's entry on Dirac: He was the first to develop quantum field theory, which underlies all theoretical work on ...

5

QFT was formulated over many decades, from the 20's to the 70's, by many people from the USA, Europe and the USSR, amongst others. Although QFT is an active research topic, QFT was demonstrated to be consistent by 't Hooft in the 70's. Whilst particular achievements and developments are attributable to specific individuals, QFT was the result of innumerable ...

1

If the incident radiation is unpolarized, it can be seen as the sum of two mutually incoherent terms: the first one due to a polarization perpendicular to the scattering plane and the second one contained in this plane. For each term, the scattered radiation preserves the polarization. The first term does not vary with $\theta$, since the induced dipole is ...

3

The first report of non-baryonic matter that I know was Evidence for Detection of a Moving Magnetic Monopole, Phys. Rev. Lett. 35, 487–490 (1975). However I'd guess you were thinking of more conventional dark matter candidates, and the first remotely credible publication I know of was the DAMA experiment. I should add that neither experiment is viewed as a ...

2

According to the same Wikipedia article you cite, ...the zero point is determined by placing the thermometer in brine: he used a mixture of ice, water, and ammonium chloride, a salt, at a 1:1:1 ratio. This is a frigorific mixture which stabilizes its temperature automatically: that stable temperature was defined as 0 °F (−17.78 °C). The second point, at ...

1

The story is this, as much as I remember. Fahrenheit chose the zero point on his scale as the temperature of a bath of ice melting in a solution of common table salt (a routine 18th century way of getting a low temperature). He set $32^{\circ}$ as the temperature of ice melting in water. For a reproducible high point on the scale he chose the temperature of ...

1

You might be looking for the tautochrone curve (found by Huygens). The corresponding surface is not an "inclined plane", which might explain the difficulty in googling it.

0

PBS nova series the elegant universe is informative and thought provoking http://www.youtube.com/playlist?list=PLmvKWW9SB-_6ExPWrvpfY37ibQCKcqq2D

0

how can he even judge the relationship between two forces without knowing the quantitative defination of force ?? One can't. The concept "Force" is an abstraction from observation and must be well defined before quantitative relationships (once, twice, thrice, etc.) can be established. But this was Newton's accomplishment, correctly recognizing and ...

Top 50 recent answers are included