A 1.5-m string is held fixed at both ends.When driven by a 180-Hz source,the string vibrates in 3 distinct segments.What is the natural fundamental frequency of the string?
A) 30 Hz
B) 60 Hz
C) 90 Hz
D) 540 Hz

Question

Quizplus · Accepted Answer

The string vibrates in 3 segments, indicating the third harmonic (n=3). The frequency of the third harmonic is 180 Hz. The fundamental frequency (first harmonic, n=1) is 180 Hz / 3 = 60 Hz.

A 15-M String Is Held Fixed at Both Ends