# physics

posted by
**Rachel**
.

Construct a 5th mode standing wave on a string that has an unknown mass hanging from one end. The distance between fixed ends of the string is 0.9 meters. If the wave speed on the 1.3 meter string is 216 meters per seconds and the string has a mass of 3 grams, what is the value for the unknown mass and frequency? Instead of solving for the answer explain how to solve this problem.