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 demonstrates sonar mapping of the ocean floor.

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

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

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.

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

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

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

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

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.

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 demonstrates the principles of reflection through simple experiments involving mirrors and light.

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

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.

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.

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

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.

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

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

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

.Have you ever had problems with your wifi signal strength? In this experiment you will learn about how wireless signals pass through the air and solid objects.

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

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

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