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.

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

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

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

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

This science fair project idea produces varying pitches of sound.

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

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

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.

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

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.

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

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

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 a mathematical relationship between the intensity of a sound wave and distance from the sound source. Use a pedometer and a sound level meter.

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.

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

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

This science project examines the history of earthquakes and what we can do to prevent future disasters.

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

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

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

Design a hearing protection device to protect their ears from loud noises. Examine the properties of current protective hearing devices, materials.

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