A summary of Plancks hypotheses

1. An oscillator can only have one of a discrete set of possible values of energy E = nhf.

2. The emission and absorption of radiation are associated with transitions between these levels. The energy emitted or absorbed appearing as a quantum of radiant energy of magnitude hf, which is the energy separation between the levels.

The light emitted from the hot surface comes in discrete quanta of energy hf, where f is the frequency of the radiation. When an oscillator emits a photon it drops from energy an level

The constant h is one of the fundamental constants of nature.

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