Asked by Mariah

Use a sine function to graph a sound wave with a period of 0.004 of a second and an amplitude of 3 cm. Find the frequency in hertz for this sound wave. (Enter only the number.)
Answered by Steve
this is just the other problem in reverse. Why not give it a shot? You know that the period of sin(kx) is 2π/k...

Also, period = 1/frequency
Answered by Mariah
Ohh, I see. So, you would multiply 2 x pi x 3 or x 0.004? What is k equal to?
Answered by Mariah
I know we multiply 2pi times coefficient. In this case, I guess I am asking what that is.
Answered by Mariah
Sorry, I just wanted to make my question more clear.
Answered by Mariah
I think I got the answer. I did 1/0.004 and got 250 hz.
Answered by Steve
C'mon.

If 2π/k = .004, k = 2π/.004 = 500π
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