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amplitude

Amplitude
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Amplitude

Amplitude is how far a wave rises or falls. We sense the amplitude of sound waves as their loudness, the amplitude of visible light waves as their intensity.

We don't sense radio waves, but changing their amplitude made the first radio transmissions possible. How do you measure and alter amplitude? And what does it have to to with circles and triangles? Find out.

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Amplitude: Trigonometry

Amplitude: Trigonometry

Trigonometry comes from the Ancient Greek words for “measure” and triangle.” So what does it have to do with waves and amplitudes? Find out here. More...

Article
Google Sites
Sound Amplitude and Musical Dynamics

Sound Amplitude and Musical Dynamics

Important: Amplitude looks much different in a TRANSVERSE wave, like a water wave, than it does in a LONGITUDINAL wave, like a sound wave. Get the full picture with this article and its links. More...

Article
Connexions
Amplitude, Period, Frequency and Wavelength of Periodic Waves

Amplitude, Period, Frequency and Wavelength of Periodic Waves

For a great explanation of amplitude, watch the first 4 minutes of this video. For an explanation of period, frequency, and wavelength, watch the rest. More...

Video
Khan Academy
Amplitude, Wavelength, and Frequency

Amplitude, Wavelength, and Frequency

Try your hand at varying the frequency, amplitude, and length of waves. In real life, waves often fly by at the rate of thousands, millions, or even billions per second. More...

Interactive
BBC
Force, Energy, & Motion: Wave Amplitude

Force, Energy, & Motion: Wave Amplitude

Imagine a boat on an ocean wave. The boat shows only one thing about the wave: its amplitude. The wave causes the boat to move in no direction except up and down. More...

Article
Utah Education Network
Sound Waves: Amplitude

Sound Waves: Amplitude

Amplitude is a measure of energy in a wave. The more energy in a sound wave, the louder it is. More...

Video
Region 10
The Engineering History of AM Radio

The Engineering History of AM Radio

Changing the amplitude of radio waves made the first radio broadcast possible. More than 100 years later, AM (Amplitude Modulation) radio lives on. More...

Article
Bright Hub Engineering
What Is the Amplitude of a Wave?

What Is the Amplitude of a Wave?

Remember: Amplitude tells you the intensity of a wave, whether it's a light wave or a sound wave. More...

Interactive
University of California Regents

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