When Vibrating at a Frequency of 12 Hz, a Standing

Multiple Choice

When vibrating at a frequency of 12 Hz, a standing wave pattern containing four loops is produced in a string fixed at both ends. To produce a standing wave pattern containing five loops, the frequency of vibration is

A) 1.7 Hz.
B) 4.0 Hz.
C) 9.6 Hz.
D) 15 Hz.
E) 60 Hz.