A speaker near you is emitting a sound at an unknown frequency. In order to discover the frequency, you use a tuning fork to emit a sound of 300 Hz, causing you to hear a beat frequency of 50 Hz.
(a) What are the possible frequencies of the speaker?
(b) If you use second tuning fork at a frequency of 320 Hz, and you measure a second beat frequency of 70 Hz, what must the frequency of the speaker be?
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