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Mini-Quiz: Equation for Sound Created from a String

by Ron Kurtus

Take this Mini-Quiz to check your understanding of the lesson material.

1. Why is the equation f = (1/2L)√(T/μ) an approximation?

It doesn't take into account effects from the type of material

The square root sign means approximation

It depends on the length

2. If you increase the tension on the string 4 times, what happens to the fundamental frequency?

It goes down by 1/2

It doubles

It becomes 707 Hz

3. If you know the tension, length and frequency of the string, how do you determine its mass?

Enter the values to solve the equation m = T/4Lf²

Enter the values to solve the equation μ = m/L

You need more information to determine the mass

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

Experiment to see what happens

Resources and references

Ron Kurtus' Credentials

The following resources provide information on this subject:


Vibrating String - Hyperphysics

Vibration of Stretched Strings -

Vibrating string - Wikipedia

Physics Resources


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