18. Waves & Sound
Beats
Multiple Choice
Multiple ChoiceA string emits an unknown sound. You strike a tuning fork which emits a sound at EXACTLY 300 Hz, and you hear a beat frequency of 20 Hz. You then tighten the string, increasing the tension in string. After you pluck the string and strike the tuning fork, you hear a new beat frequency of 30 Hz. What is the unknown frequency of the string, originally?
A
270 Hz
B
280 Hz
C
320 Hz
D
330 Hz
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