Question

A sound wave is modeled with the equation y= 1/4 cos2pi/3 theta.
a. Find the period. Explain your method.
b. Find the amplitude. Explain your method.

i think the period is 2pi/3 but i feel like im wrong so could someone solve this and explain it for me? tysm.

Answer 1

wrong on the period
Recall that the period of cos(kθ) is 2π/k

The amplitude of cosθ is 1
So, the amplitude of A*cosθ is A*1 = A

I'm sure your book explained this as well ...