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

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

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

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

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

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

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

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

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

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.

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

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

What is the Doppler Effect, or the Doppler Shift? The purpose of this science fair project is to determine how distance impacts the Doppler Effect.

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

Get a cool and easy science fair project idea which helps high school students in understanding concepts behind the working of a microphone.

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.

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

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

This science fair project idea demonstrates sonar mapping of the ocean floor.

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.

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