The laws list
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W.
watt; W (
after
J. Watt, 1736-1819)
The derived
SI
unit of power, defined as a power of 1
J
acting over a period of 1
s
; it thus has units of
J
/
s
.
wave-particle duality
The principle of quantum mechanics which implies that light (and, indeed, all other subatomic particles) sometimes act like a wave, and sometime act like a particle, depending on the experiment you are performing. For instance, low frequency electromagnetic radiation tends to act more like a wave than a particle; high frequency electromagnetic radiation tends to act more like a particle than a wave.
weak equivalence principle; principle of uniqueness of freefall
The idea within general relativity that the worldline of a freefalling body is independent of its composition, structure, or state. This principle, embraced by Newtonian mechanics and gravitation when Newton set the inertial and gravitational masses equal to each other. This principle is incorporated into a stronger version with the
equivalence principle
.
weber; Wb (
after
W. Weber, 1804-1891)
The derived
SI
unit of magnetic flux equal to the flux that, linking a circuit of one turn, produces in it an electromotive force of 1
V
as it is reduced to zero at a uniform rate in a period of 1
s
; it thus has units of
V
s
.
Weiss constant
A characteristic constant dependent on the material, used in calculating the susceptibility of paramagnetic materials.
See
Curie-Weiss law
.
Wiedemann-Franz law
The ratio of the thermal conductivity of any pure metal to its electrical conductivity is approximately constant for any given temperature. This law holds fairly well except at low temperatures.
Wien displacement law
For a blackbody, the product of the wavelength corresponding to the maximum radiancy and the thermodynamic temperature is a
constant, the Wien displacement law constant
. As a result, as the temperature rises, the maximum of the radiant energy shifts toward the shorter wavelength (higher frequency and energy) end of the spectrum.
Wien's displacement law constant,
b
The constant of the
Wien displacement law
. It has the value 2.897 756 x 10
-3
m
K
.
Woodward-Hoffmann rules
Rules governing the formation of products during certain types of organic reactions.
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