# Mini-Quiz: Equation for Sound Created from a String

by Ron Kurtus (revised 12 March 2012)

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

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:

### Websites

Vibrating String - Hyperphysics

Vibration of Stretched Strings - TutorVista.com

Vibrating string - Wikipedia

Physics Resources

### Books

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## Students and researchers

www.school-for-champions.com/science/
mini-quiz_sound_from_string_equation.htm

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