PhysicsLAB Lab
Speed of Sound in Copper

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In this experiment, we will use a Kundt's Tube to calculate the speed of sound in a copper rod. Our apparatus includes a glass tube containing a layer of fine cork dust, a wooden dowel, and a copper rod. The copper rod will be inserted into the glass tube and its midpoint securely clamped. The end of the rod inside the tube has a vibrating disk which will agitate the air and the cork dust in the resonating chamber when the outer end of the rod is excited.
 
 
We will collect the following data: the lengths of the loop in the copper rod and several loops in the cork dust as well as the temperature in the room.
 
 
Data:
temperature of room (in ºC) 

length of copper rod (in meters) 

length of first loop in dust (in meters) 

length of second loop in dust (in meters) 

 
Calculations:
average length of a loop in the resonating air chamber (in meters) 

average wavelength of sound in air (in meters) 

calculated speed of sound in air (in m/sec) 

frequency of sound in air (in hz) 

frequency of sound in copper (in hz) 

wavelength of fundamental frequency in copper (in meters) 

calculated speed of sound in copper (in m/sec) 

 
Error Analysis:
The actual speed of sound in copper is 3500 m/sec. Calculate your experimental percent error. 



Before submitting your reports, make sure that all of your numerical answers are expressed in terms of the stipulated units.

 
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