JJ Thomson is intimately connected with the concept of the electron. He is credited with the discovery of electrons. More...

Physics Narrative 14-16

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

Stand on the footplate of a speeding locomotive and, no matter what the speed at which the countryside passes, you'll always...

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

Why does the angle of incidence = the angle of reflection ? One answer explored earlier is an appeal to the rules about rays...

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