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

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

This awesome diffraction grating experiment puts high school students' applied math skills to the test by having them calculate the wavelength of laser light.

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.

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

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

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

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

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

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

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

This science fair project idea produces varying pitches of sound.

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

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

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

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

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

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

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.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

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.

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.

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

In this project students determine which instruments composers use to create birdsongs and birdcalls in classical music.

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.

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.

This experiment investigates whether there are certain sounds that affect men and women differently

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