In this activity, students get to explore possibilities to find out why a refracted beam follows the path that it does. They...

Classroom Activity 14-16

In this activity, students get to explore why a reflected beam follows the path that it does. They use a physical model to...

Classroom Activity 14-16

As you add a thickness of absorber, so the power in a beam decreases by a constant fraction. This leads to an exponential...

Classroom Activity 14-16

Bats see somewhat differently from us–they see with sound. They also actively sense their environment, unlike humans. We see...

Classroom Activity 14-16

Diagnostic questions relating to sound and light waves.

Diagnostic Questions 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

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