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

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.

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.

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 idea produces varying pitches of sound.

This experiment will explore how mallets of various materials and weight create sonic tones of varying lengths.

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

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.

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

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

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

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

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

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

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

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

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

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.

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

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

This project determines what percentage of test subjects react adversely to the sound of fingernails on a chalkboard and explores their physiological responses.

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.

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

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

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.

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

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.

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