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.

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

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

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

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

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

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

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.

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

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

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

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.

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.

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

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

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.

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

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.

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

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.

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

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.

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

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