Question

1. A student tunes his guitar by striking a 120 Hz with a tuning force, and simultaneously plays the 4th
string on his guitar. By keen observation he hears the amplitude of the combined sound oscillating
thrice per second. Which of the following frequencies in the most likely the frequency of the 4th
string on his guitar?
a) 130
b) 117
c) 110
d) 120​

Answer 1

Answer:

117 is the right answer.....