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

question 36

Multiple Choice

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,
​
Where t is the time (in seconds) .
​
The frequency is given by f = 1 / p.What is the frequency of the note?
​

• A)85 cycles/sec
• B) \[\frac { 1 } { 425 }\] cycles/sec
• C) \[\frac { 1 } { 850 }\] cycles/sec
• D)850 cycles/sec
• E)425 cycles/sec

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