Given that the minimum point of the AM waveform is zero, let's recalculate the modulation index.

### Updated Step-by-Step Process:

1. **Identify the given parameters**:
   - The minimum amplitude \(A_{\text{min}} = 0\).
   - The carrier amplitude \(A_c = 0.8 \text{ V}\).
   - The maximum amplitude \(A_{\text{max}}\) can be inferred from the carrier and modulating signals.

2. **Calculate the maximum amplitude**:
   - \(A_{\text{max}} = A_c + \) (the peak value above the carrier), which is given by the modulation's peak value.
   - Since the minimum point is zero, \(A_{\text{max}} = 2 \times A_c = 1.6 \text{ V}\).

3. **Use the formula for modulation index \(m\)**:
   \[
   m = \frac{A_{\text{max}} - A_{\text{min}}}{A_{\text{max}} + A_{\text{min}}}
   \]

   Substituting the values:
   \[
   m = \frac{1.6 - 0}{1.6 + 0} = \frac{1.6}{1.6} = 1.0
   \]

### Final Answer:
The modulation index \(m\) is **1.0**.

Would you like more details or have any further questions?

### Relative Questions:
1. What does a modulation index of 1.0 signify in terms of signal transmission?
2. How would the AM waveform change if the modulation index were slightly above 1?
3. What are the consequences of under-modulation (when \(m < 1\)) in AM signals?
4. How does the modulation index influence bandwidth in an AM signal?
5. What techniques are used to measure the modulation index in practical scenarios?

### Tip:
A modulation index of 1.0 indicates 100% modulation, where the signal is fully modulated without distortion. Beyond this, over-modulation occurs, leading to signal distortion and potential loss of information.

Explore how to calculate the modulation index of an AM waveform with a minimum amplitude of zero. Detailed steps include identifying amplitude parameters, calculating the maximum amplitude, and applying the modulation index formula. Gain insights into signal modulation and practical implications. Suitable for advanced learners and engineers.

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