When Tuning a Piano,a Technician Strikes a Tuning Fork for the a Above

When tuning a piano,a technician strikes a tuning fork for the A above middle C and sets up a wave motion that can be approximated by ​
Y = 0.001 sin 850πt,
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Where t is the time (in seconds) .
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The frequency is given by f = 1 / p.What is the frequency of the note?
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A) 85 cycles/sec
B) $$\frac { 1 } { 425 }$$ cycles/sec
C) $$\frac { 1 } { 850 }$$ cycles/sec
D) 850 cycles/sec
E) 425 cycles/sec

Correct Answer:

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