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

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

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.

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

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

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

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

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

The objective of this experiment is to identify common materials that absorb sound waves with the greatest efficiency.

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.

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

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

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

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

.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 experiment will explore how mallets of various materials and weight create sonic tones of varying lengths.

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.

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

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

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

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

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

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.

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

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

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

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