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

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

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.

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.

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

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.

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

.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.

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

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.

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

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.

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

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

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.

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.

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

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

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

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.

This science fair project idea produces varying pitches of sound.

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