Limit of audibility: Set of rods that ring at different frequencies.

3C20.16 • G+60+15

This is a set of 10 solid metal cylinders suspended on strings to resonate from 4084 Hz to 32,768 Hz. A small wooden hammer is used to strike the bars. The audible range for humans is about 20 Hz to 20,000 Hz. With age, the high frequency limit may shrink to 10,000 hz or less. Ref.:Physics For Scientists and Engineers by Giancoli, 2nd ed., p. 383 PERCEPTION.

Related Demos

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3C20.15 Galton's whistle: Compressed air whistle. 3C20.16 Steel spring pendulum, inverted, vibrates at 10 Hz. 3C20.30 Siren: large, electric motor driven. 3C20.30 Compressed air jet blows through spinning disk with holes. 3C20.40 Savart's wheel: Toothed wheel and cardboard or air jet. 3C20.40 Sprockets on shaft rotate against a card to make sound.

G+60+5 Pulfrich Effect: Pendulum and polaroid experiment. G+60+10 Limit of resolution: Two movable pin-points of light. G+60+20 Set of color blindness cards. G+60+25 Rotating disk with black and white lines makes color illusion. G+60+30 Purkinje effect: At low intensity, blue is more visible than red. G+60+35 Two sides plus red and green light gives full color illusion. G+60+40 Detection of the IR, visible, and UV spectra using arc lamp on TV camera.