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Little scientists will make inferences about hearing loss, pitch, and frequency in this great science fair idea that puts the human ear to the test.

In this cool science fair project, kids apply basic algebra to learn how to make a PVC pipe instrument while exploring concepts like frequency and resonance.

.Have you ever had problems with your wifi signal strength? In this experiment you will learn about how wireless signals pass through the air and solid objects.

Explore the wave-particle duality of light! Learn how light can behave as both a wave and a particle in this cool physics science fair project idea for kids.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

What is the Doppler Effect, or the Doppler Shift? The purpose of this science fair project is to determine how distance impacts the Doppler Effect.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

Find out whether matching resonant frequencies can cause objects to shatter.

In this science fair experiment, students learn about the scientific principles behind Doppler ultrasound.

The objective of this experiment is to identify common materials that absorb sound waves with the greatest efficiency.

The purpose of this science fair project is to build a basic radio.

This science fair project idea produces sounds by creating vibrations using different objects.

This awesome diffraction grating experiment puts high school students' applied math skills to the test by having them calculate the wavelength of laser light.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

This science fair project idea produces varying pitches of sound.

Discover whether different amounts of water added into a wine glass will produce a different pitch when their fingers are rubbed along the rim.

The goal of this science fair project is to evaluate the effect of heat on sound wave frequency.

This science fair project examines how tsunamis travel by simulating a tsunami moving around an island. You will generate a pretend tsunami in a swimming pool.

This science fair project idea shows how a vibrating object transfers energy to whatever it touches.

This science fair project idea demonstrates sonar mapping of the ocean floor.

Design a hearing protection device to protect their ears from loud noises. Examine the properties of current protective hearing devices, materials.

This science fair project idea explores whether talking to a plant will help it grow.

Demonstrate how we are able to locate sounds, echolocation. Have a blindfolded subject locate you by the sound of your clapping.

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.