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.

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 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 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.

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

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.

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

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

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

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 idea produces varying pitches of sound.

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.

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.

.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.

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

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

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

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.

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

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.