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

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

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

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.

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

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

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

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

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

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

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

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

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 demonstrates sonar mapping of the ocean floor.

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

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