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Frequency and Period of a Wave
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Frequency and Period of a Wave

How can you tell an X-ray from a radio wave, a rumble from a screech? Different kinds of waves have different frequencies.

Frequency is the measure of how many waves from a certain source pass a certain point in a certain period of time. In one second, some waves will speed past you by the thousands, others by the billions. Explore why.

The Physics Classroom
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Pitch and Frequency

Pitch and Frequency

The frequency of sound waves determines whether we can hear them, but also whether we like what we hear. More...

Article
The Physics Classroom
The Doppler Effect

The Doppler Effect

The Doppler effect can be observed for any type of wave: sound waves, water waves or light waves. Get a detailed explanation of how frequency and wavelength interact. More...

Article
The Physics Classroom
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
Frequency-Dependent Sound Absorption

Frequency-Dependent Sound Absorption

Does acoustic foam or other sound-absorbing materials change the frequency of sound? Find out with this hands-on activity. More...

Activity
Science Buddies
Fun with Standing Waves

Fun with Standing Waves

Watch how the vibrations from a stereo speaker create a variety of standing wave patterns as the frequency changes. More...

Video
Popular Science
Sound: Vibration, Frequency, Wavelength

Sound: Vibration, Frequency, Wavelength

Ever wonder what educational films were like when your great-grandparents were kids? Learn about the frequency of sound waves the way they did. More...

Video
Encyclopedia Britannica
The 5 Worst Sounds in the Universe

The 5 Worst Sounds in the Universe

Listen to the sounds here if you dare. Why are they so unpleasant? It all boils down to how our brains react to certain frequencies of sound. More...

Interactive
TIME Magazine
The Electromagnetic Spectrum

The Electromagnetic Spectrum

What’s the difference between radio waves, visible colors, X-rays, and all the other types of light waves in the electromagnetic spectrum? Each has a particular wavelength and frequency. More...

Video
NASA
Wave Speed, Frequency, and Wavelength

Wave Speed, Frequency, and Wavelength

Use these animations to review your understanding of the frequency, speed, and length of waves. Use the brief quiz at the end to test your knowledge. More...

Interactive
Crocodile Clips

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