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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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http://hyperphysics.phy-astr.gsu.edu/hbase/ems3.html#c1
hyperphysics

Resonant Frequency

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

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http://hyperphysics.phy-astr.gsu.edu/hbase/sound/reson.html#resdef

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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http://hyperphysics.phy-astr.gsu.edu/hbase/sound/beat.html
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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Hits: 1423

http://hyperphysics.phy-astr.gsu.edu/hbase/audio/equal.html#c3

What is frequency?

A short description of what is frequency

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Hits: 448

http://www.qrg.northwestern.edu/projects/vss/docs/communications/1-what-is-frequency.html
hyperphysics

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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http://hyperphysics.phy-astr.gsu.edu/hbase/mod2.html#c3
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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Hits: 702

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/pitch.html#c1
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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Hits: 1506

http://hyperphysics.phy-astr.gsu.edu/hbase/audio/sumdif.html#c2

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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Hits: 471

http://www.nist.gov/time-frequency-portal.cfm

Amplitude, wavelength and frequency

Good revision for waves covering amplitude, wavelength and frequency.

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Hits: 517

http://bbc.in/Xe00N7
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