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Quantum theory(量子理论)
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2008-11-27
打马过草原
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Twentieth-century physics began with Planck’s postulate,
in 1900, that electromagnetic radiation is not continuously
absorbed or emitted, but comes in quanta of
energy hn , where n is the frequency and h Planck’s constant.
Planck got to this postulate in a complicated way,
starting from statistical mechanics. He derived from it
his famous law of the spectral distribution of blackbody
radiation,
n~n !5@ehn /kT21#21, (1)
which has been confirmed by many experiments. It is
also accurately fulfilled by the cosmic background radiation,
which is a relic of the big bang and has a temperature
T52.7 K.
Einstein, in 1905,
in 1900, that electromagnetic radiation is not continuously
absorbed or emitted, but comes in quanta of
energy hn , where n is the frequency and h Planck’s constant.
Planck got to this postulate in a complicated way,
starting from statistical mechanics. He derived from it
his famous law of the spectral distribution of blackbody
radiation,
n~n !5@ehn /kT21#21, (1)
which has been confirmed by many experiments. It is
also accurately fulfilled by the cosmic background radiation,
which is a relic of the big bang and has a temperature
T52.7 K.
Einstein, in 1905,
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