Learn how sound ... waves and pitch. What is the volume of sound? Sounds are vibrations that travel through the air. A weak vibration doesn't travel very far. Discover more about volume. All about ...

A drum with a tight skin makes a high pitched wave. Find out more about sound waves and pitch. What is light? Light comes from different sources, like lamps, bulbs and the sun. Find out more about ...

Here we use photonics, or light energy, to produce the sound wave. This approach has multiple advantages, chief of which is ...