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What is Planck's constant?
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Planck's constant, symbolized h, relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation.

In the International System of units (SI), the constant is equal to approximately 6.626176 x 10^-34 joule-seconds. In the centimeter-gram-second (cgs) or small-unit metric system, it is equal to approximately 6.626176 x 10^-27 erg-seconds.

The energy E contained in a photon, which represents the smallest possible “packet” of energy in an electromagnetic wave, is directly proportional to the frequency f according to the following equation:

E = hf

If E is given in joules and f is given in hertz (the unit measure of frequency), then:

E = (6.626176 x 10^-34) f

and conversely:

f = E / (6.626176 x 10^-34)

by Wooden (698 points)
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Is a physical constant that is the quantum of electromagnetic action, which relates the energy carried by a photon to its frequency.
by Wooden (494 points)
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A fundamental constant equal to the energy of a quantum of electromagnetic radiation divided by its frequency, with a value of 6,626x10^-34 joules per second.
by Wooden (310 points)