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.

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

This awesome diffraction grating experiment puts high school students' applied math skills to the test by having them calculate the wavelength of laser light.

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

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.

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

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

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

.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 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.

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

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

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

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.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

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.

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

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

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

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

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

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

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

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

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