Determining the velocity of sound in solids

VP1.7.3.5
Determining the velocity of sound in solids
Determining the velocity of sound in solids Velocity of sound in different materials (P1.7.3.5)
Determining the velocity of sound in solids

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Description

The object of the experiment P1.7.3.5 is to determine the velocity of sound in aluminum, copper, brass and steel rods. This measurement exploits the multiple reflections of a brief sound pulse at the rod ends. The pulse is generated by striking the top end of the rod with a hammer, and initially travels to the bottom. The pulse is reflected several times in succession at the two ends of the rod, whereby the pulses arriving at one end are delayed with respect to each other by the time Δt required to travel out and back. The velocity of sound is thus

To record the pulses, the bottom end of the rod rests on a piezoelectric element which converts the compressive oscillations of the sound pulse into electrical oscillations. These values are recorded using the CASSY system for computer-assisted measured-value recording.

Components of equipment sets

1 413651  8  Metal rods, 1.5 m, set of 3 LD
1 30046  4  Stand rod, 150 cm, 12 mm diam. LD
1 587251  8  Rochelle salt crystal (piezo-electric element) LD
1 524013  8  Sensor-CASSY 2 LD
1 524220  4  CASSY Lab 2 LD
1 30107  8  Simple bench clamp LD
1 50135  4  Connecting lead, 32 A, 200 cm, red LD
1 50136  4  Connecting lead, 32 A, 200 cm, blue LD
1 additionally required:
PC with Windows XP/Vista/7/8/10 (x86 or x64)

Experiment Instructions

PDF (Description from CASSY Lab) PDF (Description from CASSY Lab) P1.7.3.5 Determining the velocity of sound in solids
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