energy

Spoon Bells

Any time you hear a sound, it is because something is vibrating. Place your fingers against your throat and hum. You will feel your throat vibrate. We usually hear sounds from vibrations that travel through the air, but solids can be much better at carrying vibrations.

Light a Bulb with a Balloon

We are used to thinking that it takes a lot of energy to produce light. This time, we will see that even a small amount of the right kind of energy can give us some light.

This experiment will not work with the incandescent bulbs commonly used in lamps. They have a thin wire, called a filament, which has to get hot enough to glow to give you some light. That takes quite a bit of energy, and much of it is lost as heat.

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