Many things oscillate–that is, move to and fro about an origin. In the SPT: Sound topic, some of these oscillations were shown...

Physics Narrative 14-16

Do like me, but later, is the fundamental instruction that allows influence to propagate from source to detector. People don't...

Physics Narrative 14-16

When a beam strikes a block of material, there are three possibilities: reflection, absorption and transmission. All three may...

Physics Narrative 14-16

Reflections are all around–most of the things we see are as a result of reflections: luminous objects are greatly outnumbered...

Physics Narrative 14-16

A lens is a simple block of glass through which light passes: it's refracted as it passes. The block must be very cunningly...

Physics Narrative 14-16

It's possible to build up a picture of the world just from a series of times. That's what bats do, by a process of active...

Physics Narrative 14-16

As the frequency shift is set by the velocity of the source, measurements of the frequency shift allow you to determine that...

Physics Narrative 14-16

The speed of light is constant. It is the same everywhere, and is the top speed: a universal speed limit. The way we measure...

Physics Narrative 14-16

Angling two mirrors can focus two beams. You can predict where it will be brighter by drawing rays from two sources, and using...

Physics Narrative 14-16

Signals communicate information, and the need to get that information over long distances and through adverse conditions has...

Physics Narrative 14-16

Amplitude modulation is one way of encoding a signal on a carrier wave.

Physics Narrative 14-16

Frequency modulation is another way of encoding a signal on a carrier wave.

Physics Narrative 14-16