Guitars can make sound of different pitches by using strings of different thicknesses When two things hit against each other, they set up a vibration that reaches your ear as a sound. [...]
Playing a French horn makes sounds because you blow into it and that moves the air Like light, sound travels through the air in waves, but unlike light, sound is not [...]
You can make a guitar out of a shoebox and rubber bands Begin by making some loud noises, like hitting a drum and clapping your hands. Can you feel the [...]
Sine wave In order to save energy, many, many things in nature move in a kind of repeated pattern we call a sine wave: water waves, sound waves, light waves, [...]
You can see that helium is lighter than air by getting a helium balloon. When you let go of it, it goes up, because the helium is lighter than the nitrogen and [...]
