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# Answer to Question #6066 in Other Philosophy for jacky

Question #6066
important significant numbers used in the world such as speed of light
find 4 more
1
2012-01-20T07:20:52-0500
speed of sound
The speed of sound is the distance travelled during a unit of time by a sound wave propagating through an elastic medium. In dry air
at 20 &deg;C (68 &deg;F), the speed of sound is 343.2 metres per second (1,126 ft/s).
This is 1,236 kilometres per hour (768 mph), or about one kilometer in three
seconds or approximately one mile in five seconds.
gravitational constant
The gravitational constant, denoted G, is an empirical physical constant involved in the calculation of the gravitational
attraction between objects with mass. It appears in Newton&#039;s law of universal
gravitation, and in Albert Einstein&#039;s theory of general relativity. It is also
known as the universal gravitational constant, Newton&#039;s constant, and
colloquially as Big G. It should not be confused with &quot;little g&quot; (g), which is
the local gravitational field (equivalent to the free-fall acceleration),
especially that at the Earth&#039;s surface.

Planck constant
The Planck constant (denoted h), also called Planck&#039;s constant, is a physical constant reflecting the sizes of energy quanta
in quantum mechanics. It is named after Max Planck, one of the founders of
quantum theory, who discovered it in 1900. Classical statistical mechanics
requires the existence of h (but does not define its value).

The Planck constant was first described as the proportionality constant between the energy
(E) of a photon and the frequency of its associated electromagnetic wave (&nu;).
This relation between the energy and frequency is called the Planck relation or
the Planck&ndash;Einstein equation:
Since the frequency &nu;, wavelength &lambda;, and speed of light c are related by &lambda;&nu; = c, the
Planck relation can also be expressed as
Boltzmann constant
The Boltzmann constant (k or kB) is the physical constant relating energy at the individual particle level with temperature,
which must necessarily be observed at the collective or bulk level. It is the
gas constant R divided by the Avogadro constant NA:

J&thinsp;K^&minus;1

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