# In-Class Activities

By

Ervin Chia

,

Chua Wei Hong

,

Hillson Hung

,

Nemo Chen

●

Published 2022-08-15

Watch the ripple tank demo in lecture. Play with it in if time allows. Note the interference pattern.

On Desmos enter the following lines:

\begin{align*}
f & =\cos x\\
g & =\cos(x+\phi)\\
f & +g
\end{align*}

Click to add slider for \phi the phase angle, and set it to go from 0 to 2\pi. Slide to see how g changes for different values of \phi. Also observe how the superposition of the two waves f+g changes.

Relate the math (graphs on Desmos) and the phenomenum (waves in ripple tank).

Form diffraction patterns using a thin wire, double slits, etc, and a laser.

Watch the photoelectric effect demo in lecture and try it out during tutorial.

Use a diffraction grating to look at various light sources: Gas discharge lamps, LEDS, incandescent light bulb, etc.

Play with the PhET blackbody simulator. ¹

Use a portable spectrometer (OceanOptics) to see the spectrum of sunlight. Think of what is inside a spectrometer.

See electron diffraction demo. Explain the observations.