A 1.5-m string is held fixed at both ends.When driven by a 180-Hz source,the string vibrates in 4 distinct segments.What is the natural fundamental frequency of the string?
A)45 Hz
B)90 Hz
C)240 Hz
D)600 Hz

Question

Quizplus · Accepted Answer

The string vibrates in 4 segments, indicating the 4th harmonic. The frequency of the 4th harmonic is 180 Hz. The fundamental frequency (1st harmonic) is 180 Hz / 4 = 45 Hz.

A 15-M String Is Held Fixed at Both Ends