Resonant Tubes & Law of Strings

Physics

CW 02: Sound Waves

Resonant Tubes & Law of Strings

Name: ______Date: ______Period: ______

You must show the work that leads to your answer to receive credit. The answer must include the appropriate unit.

______1. What frequency will a piccolo produce with a tube diameter of 1.2 cm and

a length of 20 cm? Use an average speed of sound of 340 m/s.

______2. What frequency will a tuba produce with a tube diameter of 110 cm and a

length of 1.8 m? Use an average speed of sound of 340 m/s.

3. A 100 cm string produces a 200 Hz note. You wish to produce a note with a frequency of

400 Hz.

______a. Will the string need to be shorter or longer?

______b. What will be the length of the string that produces the note with the

400 Hz frequency?

4. A string 100 cm long produces a note with a frequency of 450 Hz. The length of the string is

changed to 50 cm.

______a. Will the new frequency be higher or lower?

______b. What will be the new frequency produced by the 50 cm string?

5. A string with a tension of 3 N produces a note with a frequency of 750 Hz. The frequency of

the note changes to 900 Hz.

______a. Has the tension been increased or decreased?

______b. What is the new tension on the string?

6. A string with a diameter of 2 mm produces a note with a frequency of 900 Hz. Another string

with a diameter of 4 mm is chosen.

______a. Will the new frequency be higher or lower?

______b. What will be the new frequency?