How radio waves are generated from oscillating charges, with a demo of a radio transmitter in the classroom.

Creating standing waves with first, second, and higher order harmonics by shaking a string up and down.

How wind instruments create sound using standing waves in the air, including a demonstration of a large pipe which creates sound after a copper grid in the pipe is heated and then cooled.

Using simple versions of a flute, trombone, and wind organ to demonstrate the way they produce different notes. Also a demonstration of a sounding board used to amplify the sound from a tuning fork and a music box.

Seeing the sound waves produced by a violin, clarinet, bassoon, and saxophone at the same frequency to show that each instrument combines harmonics in a different way to produce distinct sounds.

Explaining how the speed of sound is higher in a helium filled environment, including a demonstration of how this affects the sound of a person's voice.

Amplitude of shuttle on air track observed for high and low, then resonant, driving frequency.

Music from tube open at both ends, wooden flute; Jingle Bells on wooden trombone.

Examples from life; tuning forks; breaking a wine glass with an appropriate sound frequency.

Higher speed of sound in Helium allows higher voice.