This science fair project demonstrates the principles of reflection through simple experiments involving mirrors and light.

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

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

Make stunning pendulum waves and learn the math behind the patterns generated with this cool and easy science project.

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.

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

Find a mathematical relationship between the intensity of a sound wave and distance from the sound source. Use a pedometer and a sound level meter.

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

Find out the differences (if any) in the frequencies of voices produced from a computer, from a phone, and directly coming out of the voice box of a human.

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

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.

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

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 experiment investigates whether there are certain sounds that affect men and women differently

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.

In this cool sound resonance experiment, learn about frequency and pitch, and use a tuning fork to calculate sound velocity in air.

Get a cool and easy science fair project idea which helps high school students in understanding concepts behind the working of a microphone.

This science fair project idea produces varying pitches of sound.

In this project students determine which instruments composers use to create birdsongs and birdcalls in classical music.

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

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

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

Determine the relationship between the speed of a sound and the temperature of the air it passes through.

Check out this fun science fair project idea to learn about seismic waves and how fast they travel during an earthquake.

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

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

This classic children's game demonstrates how sound travels through air vs. through a solid.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.