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

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.

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

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

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.

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

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.

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

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

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