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

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

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

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

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

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

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.

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

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.

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 cool science fair project, kids apply basic algebra to learn how to make a PVC pipe instrument while exploring concepts like frequency and resonance.

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.

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

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

Discover whether different amounts of water added into a wine glass will produce a different pitch when their fingers are rubbed along the rim.

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

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

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

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.

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

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

Find out whether matching resonant frequencies can cause objects to shatter.

This science fair project idea produces varying pitches of sound.

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.

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