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

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.

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

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

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.

This science fair project idea produces varying pitches of sound.

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

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

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

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

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.

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

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

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

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.

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

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

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

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

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

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

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