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.

Find out whether matching resonant frequencies can cause objects to shatter.

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

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.

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

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

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

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

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

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.

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

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

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.

This science project examines the history of earthquakes and what we can do to prevent future disasters.

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

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.

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

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

This science fair project idea produces varying pitches of sound.

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

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.

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.