Waves and its Characteristics: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Waves and its Characteristics. Understanding the underlying formula is key to arriving at the correct answer below:

Comparing with $y = A \cos(\omega t + \phi)$, $\omega = 2000$. Since $\omega = 2\pi f$, $f = \frac{2000}{2\pi} = \frac{1000}{\pi} \text{ Hz}$.