Diffraction Generates a single-slit diffraction pattern. Two-Slit with Diffraction Combines the effects of interference and diffraction. Doppler Effect Visualization of the Doppler effect and Mach cones. Spectrum Explore the electromagnetic spectrum. Beats Vary two frequencies and see the corresponding beat pattern emerge.
Piano Play the piano and see the frequencies.
Electrostatics Deflection of Charges Change the voltage on the deflector plates and see the deflection of the electron beam. Field Lines Drag two variable charges and watch the field lines. Electrostatic Potential Place charges and watch the resulting electrostatic potential distribution. Capacitors Solves all kinds of capacitor network problems. Resistors Same thing for resistors.