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hyperphysics

Infrared

Inofrmation on infrared (IR), a broad range of frequencies, beginning at the top end of those frequencies used for communication and extending up the the low frequency (red) end of the visible ...

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hyperphysics

Resonant Frequency

This Hyperphysics page discusses resonance and resonant frequencies. Includes the example of a child's swing.

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Beat frequencies

When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud - a phenomenon which is ...

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Sonic Science: The High-Frequency Hearing Test

The range of frequencies the human ear can pick up changes as you grow older. Test the range of your hearing with this simple experiment.

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hyperphysics

White Noise

White noise is noise whose amplitude is constant throughout the audible frequency range. It is fairly easy to produce white noise - it is often produced by a random noise generator in which all ...

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What is frequency?

A short description of what is frequency

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Planck's Hypothesis

In order to explain the frequency distribution of radiation from a hot cavity (blackbody radiation) Planck proposed the ad hoc assumption that the radiant energy could exist only in discrete quanta ...

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hyperphysics

Pitch

The perceived pitch of a sound is just the ear's response to frequency, i.e., for most practical purposes the pitch is just the frequency.

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hyperphysics

Carrier Wave

Radio transmission involves putting audio frequency information on a much higher frequency electromagnetic wave called a carrier wave.

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Time and Frequency division of NIST

The homepage of the Time and Frequency division of NIST, which outlines their mission, technical highlights and both their current and future work.

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