A curve is plotted to represenet the dependence of the ratio of the received frequency `f` to the frequency `f_0` emitted by the source on the ratio of the speed of obsever `V_(ob)` to the speed of sound `V_(sound)` in a situation in which an observer is moving towards a stationary sound source. The curve is best represnted by :

Options

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Explanation

To solve the problem, we need to analyze the relationship between the received frequency \( f \) and the emitted frequency \( f_0 \) when an observer is moving towards a stationary sound source. We will derive the equation and identify the correct curve representation.

### Step-by-Step Solution:

1. **Understanding the Doppler Effect**:
When an observer moves towards a stationary sound source, the frequency of the sound received by the observer is higher than the frequency emitted by the source. This phenomenon is described by the Doppler effect.

2. **Doppler Effect Formula**:
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