Two strings both vibrate at exactly 819 Hz.The tension in one of them is then increased slightly.As a result,six beats per second are heard when both strings vibrate.What is the new frequency of the string that was tightened?
A)825 Hz
B)813 Hz
C)822 Hz
D)816 Hz

Question

Quizplus · Accepted Answer

The new frequency of the string that was tightened is 825 Hz. When the tension in one of the strings is increased, its frequency increases. Since six beats per second are heard, this means the difference between the frequencies of the two strings is 6 Hz. Therefore, the new frequency of the tightened string is 819 Hz + 6 Hz = 825 Hz.

Two Strings Both Vibrate at Exactly 819 Hz