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Draw a diagram of this experiment
Step 1
Set up apparatus as shown and turn on power
Step 2
Starting at 0Hz turn up the frequency until the paper rider falls off (Resonance) and record this frequency and the length between the bridges
Step 3
Move one of the bridges and repeat step 2
Step 4
Repeat step 3 four more times
Step 5
Plot a graph of f Vs. 1/l
Conclusion
A graph of f Vs 1/l produces a straight line through the origin. Therefore f is inversely proportional to l