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.

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.

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

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

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

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

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

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

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

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.

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

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.

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

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