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

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.

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

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

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

Look for a correlation between temperature and the intensity of cricket chirping. Measure ambient temperature and sound intensity in decibels.

Find a mathematical relationship between the intensity of a sound wave and distance from the sound source. Use a pedometer and a sound level meter.

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

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.

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

.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 classic children's game demonstrates how sound travels through air vs. through 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.

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

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.

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

This science fair project idea produces varying pitches of sound.

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

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.

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.

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.

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