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INDEX C3 : SOUND

C3.01 BELL IN A VACUUM

An electric bell is suspended in a bell jar. While the bell is ringing, the bell jar is evacuated, and the sound grows fainter and fainter.

C3.03 YELLOW SCREAMER

A toy siren tied to a rope is swung in a circle. As the source approaches and recedes, the perceived pitch rises and falls.

C3.04 BEAT BOX

Beats are produced using a xylophone with 6 bars tuned from A-435 to A-440.

C3.09 FREQUENCY & THE LIMITS OF AUDIBILITY

The frequency of a high pitched source is gradually increased until it is inaudible.

C3.10 SYMPATHETIC TUNING FORKS (Resonance)

A tuning fork is struck, which starts another nearby fork vibrating.

C3.11 ORGAN PIPES

A collection of wood and metal organ pipes of different lengths. One wooden pipe has a lid, so it can be either open or closed. Another pipe has a sliding piston for directly demonstrating the effect of different pipe lengths.

C3.13 LASER MODULATION FOR AUDIO TRANSMISSION

A laser beam is modulated by a sound source. When the beam is demodulated and fed into an amplifier - speaker, the source signal is heard.

C3.14 ULTRASONICS

Shows a use of ultrasonic doppler to detect fluid motion in the human body.

C3.16 SPEED OF SOUND

A tuning fork is struck above a tube of water. The height of the water column is adjusted until the fork and tube resonate. From the height of the column, the wavelength can be calculated.

C3.17 DECIBELS

Uses a decibel meter to measure different volume levels.

C3.18 LISSAJOUS MUSIC

A stereo signal is plugged into the horizontal and vertical inputs of an oscilloscope to produce Lissajous figures.

C3.19 HIGH TECH SPEED OF SOUND

The output of a microphone is fed into an oscilloscope. As the microphone is moved, the oscilloscope signal changes. This change can be used to calculate the speed of sound.

C3.20 ROTATING SPEAKERS

A signal is fed to four speakers mounted a foot apart on a horizontal bar. As the bar is rotated, interference varies the sound level.

C3.21 RESONANCE OF AN OPEN PIPE

A signal is fed through an open pipe and monitored on an oscilloscope. As the frequency of the signal is varied, the oscilloscope amplitude changes.

C3.22 BREATHING HELIUM

A mouthful of helium raises the pitch of one's voice.

C3.23 JUST INTONATION

The DX7 is programmed to play a chord in equal temperment and in just intonation. An oscilloscope shows a much smoother display for just intonation.

C3.24 SONOMETER

An electrical driver can be placed under the string to produce standing waves, and a pick-up can be connected to an oscilloscope to display the waveform at different locations.

C3.25 CHLADNI PLATES

Sand is sprinkled on plates of various shapes which are driven by a mechanical driver. The sand will settle in the nodal lines.

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