When a tuning fork A and B are sounded together,the number of beats heard are 4 per second.When tuning fork A is field,the numbe

When a tuning fork A and B are sounded together,the number of beats heard are 4 per second.When tuning fork A is field,the number of beats heard per second with B is changed to 3.If the frequency of tuning fork B is 384 Hz,the original frequency of A is
A. 388 Hz
B. 387 Hz
C. 381 Hz
D. 380 Hz

When a tuning fork A and B are sounded together,the number of beats heard are 4 per second.When tuning fork A is field,the number of beats heard per s

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