Re: Summenentropie

Am Thu, 19 Jun 2008 06:17:25 -0700 (PDT) schrieb frager:

Insgesamt

Roger Penrose, Road to Reality, merkt dazu an:

Fig. 27.9 The Earth gives back the same amount of energy that
it receives from the Sun, but what it receives from the Sun is
in a much lower entropy form, owing to the fact that the Sunʼs
yellow light has higher frequency than the infrared that the
Earth returns. Accordingly, by Planckʼs E = hny, the Sunʼs photons
carry more energy per photon than do those that Earth returns, so
the energy from the Sun is carried by fewer photons than that
returned by the Earth. Fewer photons means fewer degrees of
freedom and therefore a smaller phase-space region and thus
lower entropy than in the photons returned to space. Plants make
use of this low entropy energy in photosynthesis, thereby reducing
their own entropy, and we take advantage of the plants to reduce
ours, by eating them, or eating something that eats them, and
by breathing the oxygen that the plants release. This ultimately
comes from the temperature imbalance in the sky that resulted from
the gravitational clumping that produced the Sun.
.

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