A tuning fork is vibrating at frequency `100 Hz`. When another tuning fork is sounded simutaneously.=, `4` beats per second are heard. When some mass is added to the tuning fork of `100 Hz`, beat frequency decreases. Find the frequency of the other tuning fork.

Explanation

To solve the problem, we will follow a step-by-step approach to find the frequency of the other tuning fork.

### Step 1: Understand the Beat Frequency
The beat frequency is the difference in frequencies of two tuning forks. When two tuning forks are sounded together, the number of beats heard per second is equal to the absolute difference of their frequencies.

### Step 2: Set Up the Known Frequencies
Let:
- Frequency of tuning fork A (fA) = 100 Hz
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