A source is producing 20 waves in 4 sec. The distance between a crest and a trough is 12 cm. Find
the frequency

Explanation

To find the frequency of the waves produced by the source, we can follow these steps:

### Step 1: Understand the Definition of Frequency
Frequency (f) is defined as the number of oscillations (or waves) produced per unit time. It is mathematically expressed as:
\[ f = \frac{\text{Number of oscillations}}{\text{Time (in seconds)}} \]

### Step 2: Identify the Given Information
From the problem, we know:
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