A visual and auditory demonstration of shifted frequencies.

Classroom Activity 14-16

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

Here we're looking at how stretching space predicts the change in recession velocity of galaxies. If you stretch a piece of...

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

In this activity you can introduce students to the idea that energy can be shifted in small chunks. This is particularly...

Classroom Activity 14-16

Linking activity in the laboratory with a photon description.

Classroom Activity 14-16

This activity is all about hearing photons arrive, one by one. Draw out the random nature of their arrival, and the fact that...

Classroom Activity 14-16

This is a rather fine review activity, and should be undertaken towards the end of an introduction to the idea of photons.

Classroom Activity 14-16

Diagnostic questions exploring the understanding of lighting as a stream of photons.

Diagnostic Questions 14-16