PIRA 3B27.00 COMPOUND WAVES

DCS #DEMONSTRATIONREFERENCEABSTRACT
3B27.00Compound Waves
3B27.10slinky and soda cansPIRA 1000
3B27.10slinky and soda cans3B27.10Persons at each end of a stretched slinky generate a pulse. The addition of the pulses kicks one soda can out from a line of cans placed along the slinky. Also cancel opposite pulses.
3B27.15wave superposition - Shive modelPIRA 1000
3B27.15wave superpositionDisc 09-16Start positive pulses from each end of a Shive wave machine.
3B27.20adding waves apparatusPIRA 1000
3B27.20adding waves apparatus18-8.5A framework allows brass tubes representing two sine waves to be combined point by point to give the resultant. Projected on the overhead.
3B27.21harmonic slidersTPT 28(8),568A template with a sine wave shape is slid under a set of vertical wood bars cut to various lengths to forming a different sine waves.
3B27.21adding waves18-8.7A machine with pins cut to form a sine wave riding on a plate machined to a sine wave. Picture. Construction details in appendix, p. 635.
3B27.21wave addition modelS-28Stack several sets of vertical rods that describe sine waves to show the resultant.
3B27.22carousel waves18-8.14630 knitting needles are mounted on a bicycle wheel riding on a second coaxial bicycle wheel with a sine wave cam. Pictures. Construction details in appendix, p. 639.
3B27.23wood block interference18-8.6A framework holds wood blocks cut to length to form a sine wave. A template in the shape of another wave is pushed against the bottom of the blocks.
3B27.30double pendulum beat drawerPIRA 1000
3B27.30beat pendulaSi-6Two physical pendula with slightly different periods oscillate in parallel planes and the sum is shown by reflecting a laser beam off mounted mirrors.
3B27.30sand pendulum compound waveS-42A compound sand pendulum with both oscillations in the same plane dumps onto an endless belt.
3B27.31beat pendula18-4.1Three mirrors are mounted on two pendula of slightly different frequencies. Two show the motion of each pendulum and one shows the combination. Pictures, Diagram. Construction details in appendix, p. 625.
3B27.32recording beat pendula18-4.2Inductive pickup of the position of two pendula of slightly different frequencies. Construction details.
3B27.33photo of beat pendula18-4.3Lenses on beat pendula focus spots of light on moving photographic paper.
3B27.35turntable oscillatorsAJP 35(11),1043A phono turntable drives a horizontal platform in SHM, and two can demonstrate beats and Lissajous figures.
3B27.40beatsS-106Light is reflected off mirrors on two slightly different tuning forks to a rotating mirror and onto a screen.
3B27.45beat lights33-2.8The output of an audio oscillator is added to line frequency through a step-up transformer with 15W lamps as indicators.

ReferenceDescription
M-1Sutton
Ma-1Freier & Anderson
M-1dHilton
8-2.8Meiners
1A12.01University of Minnesota Handbook
AJP 52(1),85American Journal of Physics
TPT 15(5),300The Physics Teacher
Disc 01-01The Video Encyclopedia of Physics Demonstrations

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