Solved cryptogram

The Planck constant links a photon's energy to its frequency, and its value is fixed exactly.

Physics Facts, sourced to NIST.

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What it means

Light of a given color always carries the same energy per photon, and the Planck constant is the conversion factor. Blue photons carry more energy than red ones for exactly this reason, which is why ultraviolet light can damage skin and infrared cannot. The constant also underpins the modern definition of the kilogram, so it now has an exact value with no uncertainty attached.

The claim comes from NIST.

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