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🌊 Waves & Sound

How waves carry energy and shape the sounds you hear every day.

lessons

~30 min

to learn

🔬 Science

subject

Teens

level

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What you’ll learn

Explain what a wave is and distinguish transverse from longitudinal waves.A wave transfers energy without permanently moving matter. Transverse waves vibrate perpendicular to their travel, while longitudinal waves like sound vibrate parallel to it.
Describe wave properties and apply the relationship between speed, frequency, and wavelength.Waves are described by wavelength, frequency, and amplitude. Wave speed equals frequency times wavelength, and amplitude reflects a wave's energy. Waves reflect, refract, and diffract.
Explain how sound waves behave and connect frequency and amplitude to pitch and loudness.Sound is a longitudinal wave needing a medium, traveling fastest in solids. Frequency sets pitch and amplitude sets loudness, and waves power tools like ultrasound and sonar.

Questions this course answers

What does a wave primarily transfer?

A wave transfers energy from one place to another while the medium's particles mostly vibrate in place.

In a transverse wave, how do particles move relative to the wave?

In a transverse wave, particles vibrate at right angles (perpendicular) to the direction the wave travels.

Which of these is a longitudinal wave?

Sound is longitudinal, traveling as compressions and rarefactions where particles move parallel to the wave.

What does frequency measure?

Frequency is the number of complete waves passing a point per second, measured in hertz.

According to the wave equation, wave speed equals:

Wave speed equals frequency times wavelength, a relationship that holds for all types of waves.

A greater amplitude in a sound wave means the sound is:

Amplitude relates to a wave's energy; a larger amplitude in a sound wave produces a louder sound.

Grounded in trusted sources

OpenStax Physics, "Speed of Sound, Frequency, and Wavelength" (openstax.org)
Encyclopaedia Britannica, "Sound" and "Wave" (britannica.com)
Physics LibreTexts, College Physics, "Physics of Hearing" (phys.libretexts.org)
The Physics Classroom, "Waves" unit (physicsclassroom.com)

Every Wunder lesson is built from real, reputable sources — never invented.

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