Why do empty cans make the most noise?
Why do empty vessels make more noise?
Why does sound come from a tube light? Why does sound need a medium like air or water in order to travel, but radio waves do not? Why does blowing over the hole of a bottle create a sound? Why is there no sound in space? Why is infrasonic sound dangerous for humans but ultrasonic is not? Why do less dense materials float on water? Why can't we hear ultrasonic and infrasonic sound waves? Why do less dense liquids float on water? Why do mouths water? How come on airplanes the engines get louder and louder then takeoff (why don't they just put the throttle up all the way, why go slowly)? Why is sound considered a type of mechanical energy? Noises during sex, why do some people make sounds and some don't? Why can I hear the sound of electricity? Onomatopoeia: What's the sound a whale makes when it uses it's blowhole? Why does a boat float on water? Why do we wake up at noise? How is noise pollution caused? What causes the vapor cone when aircraft breaks the sound barrier? What are the reasons why sinking boat for the purpose of creating artificial reefs not considered a type of contamination? How do extra bass notes affect the sound of a piano? Why does wood float on water? What happens when we hear a 1000-decibel sound? How do speakers produce sound waves? Why does the speed of sound vary in different media? Why do ships made of steel not sink? What happens to sound in outer space? What happens if a jetliner breaks the sound barrier? Why do women make sounds during sex? Why do sound waves travel slower than EM waves? Why do girls make sounds during sex?