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.

This science project examines the history of earthquakes and what we can do to prevent future disasters.

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.

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

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

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

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

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.

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.

Look for a correlation between temperature and the intensity of cricket chirping. Measure ambient temperature and sound intensity in decibels.

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

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

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

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

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

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

In this physics project, learn about the relationship between light intensity and distance using a laser pointer, flashlight, and graph paper!

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

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

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

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

This science fair project idea produces varying pitches of sound.

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

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.

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.

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.

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.

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