Light of certain wavelengths excites different types of cell in your eyes so you see these inputs as colours. As the CD spins...

At home 5-11 11-14

Slinkies make sound because they vibrate when they stretch out. When they vibrate, they make the air around them vibrate. Both...

At home 5-11 11-14

The high-pitched sound you hear is created by the paper vibrating.

At home 5-11 11-14

The box amplifies the vibrations from the string as the cloth is pulled along it, making a sound that our ears can hear.

At home 5-11 11-14

The latex glove vibrates as air flows down the tube. This creates a standing wave in the air along the length of the tube...

At home 5-11 11-14

You can’t hear the bell as you have created a partial vacuum inside the bottle. Without the air in the bottle, the sound is...

At home 5-11 11-14

The two identical bottles vibrate at the same natural frequency. So when one vibrates and produces a note, this makes the...

At home 5-11 11-14

As the been swinger moves through the air, the rubber band starts to vibrate. The card amplifies the sound so that you can...

At home 5-11 11-14

The refractive index of Pyrex® glass is the same as that for vegetable oil so as light passes through the glass of both bowls...

At home 5-11 11-14

The coin reappears because the water bends, or refracts, the light travelling from the coin so that it can now reach your eye.

At home 5-11 11-14

Almost all the light from the torch is reflected every time it hits the edge of the stream of water, so the light follows the...

At home 5-11 11-14

Sound travels more slowly through carbon dioxide (the gas given off by the fizzing tablet) than through air, so when you blow...

At home 5-11 11-14