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.

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.

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

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

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.

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

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

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

This science fair project idea produces varying pitches of sound.

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.

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.

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

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

This science fair project idea shows how a vibrating object transfers energy to whatever it touches.

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

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

This experiment investigates whether there are certain sounds that affect men and women differently

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

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.