How many photons are in any single "mode" of the electromagnetic field ?

Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter26: Electromagnetism
Section: Chapter Questions
Problem 51A
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How many photons are in any single "mode" of the electromagnetic field ?

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The number of photons in any single "mode" of the electromagnetic field depends on the energy of the mode. The energy of a photon is given by Planck's constant (h) multiplied by the frequency of the mode (f).

And the number of photons is proportional to the energy of the mode.

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