Two tunning forks `A and B` when sounded together produce ` 3 beats//s`. What are the possible frequencies of `B`, if the frequency of `A is 400` cycle//s ? How can you verify which of the possible values is correct ?

Explanation

To solve the problem of determining the possible frequencies of tuning fork B when it is sounded together with tuning fork A, we can follow these steps:

### Step 1: Understand the given information
- The frequency of tuning fork A (fA) is given as 400 Hz.
- The beat frequency produced when both tuning forks A and B are sounded together is 3 beats per second.

### Step 2: Use the formula for beat frequency
The beat frequency is defined as the absolute difference between the frequencies of the two tuning forks:
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