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.

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 idea explores whether talking to a plant will help it grow.

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

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

This science fair project idea produces varying pitches of sound.

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

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

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

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

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

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

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

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.

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.

In this fun science fair project idea learn about the multiple sources of radio waves and fin out how difficult it is to block them.

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?

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

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

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 fast does light travel in different mediums? Kids conduct a cool refraction experiment in materials like water and air for this science fair project.

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.

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.

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.

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

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

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

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

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