Generating and then hearing beats.

Classroom Activity 14-16

There are a number of standard laboratory demonstrations of polarisation, from those performed with 3 cm waves, through to...

Classroom Activity 14-16

The idea here is to connect the somewhat abstract idea of superposition with a real physical experience on a human scale.

Classroom Activity 14-16

The purpose here is to show diffraction, to demonstrate that the light spreads. To do this you will need to practice and take...

Classroom Activity 14-16

This is set up as a bench top experiment, but really it's a piece of practical mathematics. If run well, it can drive home the...

Classroom Activity 14-16

This is set up as a bench top experiment, but really it's a piece of practical mathematics. If run well, it can drive home the...

Classroom Activity 14-16

Diagnostic questions exploring the diffraction, interference and polarisation of waves.

Diagnostic Questions 14-16

What happens here affects what happens over there: that is the essence of radiating. An influence travels from source to...

Physics Narrative 14-16

Radiations travel in beams: the power in a single beam, often related to the number of photons a second (emitted or absorbed)...

Physics Narrative 14-16

You have seen that two beams meeting can cause instructions from two sources to arrive at a single point–two lots of do like...

Physics Narrative 14-16

There is a lurking difficulty here, that cuts to the core of what physicists know about radiating.

Physics Narrative 14-16

Throw a pebble into a still small pond. What happens in one place pretty soon affects what happens in all. The up and down...

Physics Narrative 14-16