Walls of auditorium should be

Options

A. good absorbe
B. good reflector
C. good amplifier
D. none of these

Explanation

### Step-by-Step Solution:

1. **Understanding the Purpose of Auditorium Walls**:
- The primary function of the walls in an auditorium is to manage sound effectively. This includes controlling how sound is absorbed, reflected, and amplified within the space.

2. **Identifying the Desired Properties**:
- The walls should ideally be designed to absorb sound rather than reflect it. This is important to prevent echoes and ensure clear sound quality during performances or speeches.

3. **Explaining Reverberation Time**:
- Reverberation time is the time it takes for sound to decay in a space after the source has stopped. For an auditorium, it is crucial to optimize this time to enhance the listening experience.

4. **Evaluating the Options**:
- **Good Absorber**: This is the desired property. Good absorbers will minimize sound reflections, reducing echoes and ensuring clarity.
- **Good Reflector**: This is not desirable in an auditorium as it would lead to excessive sound reflection, causing echoes.
- **Good Amplifier**: This is also not desirable because it would increase noise levels rather than provide clarity.

5. **Conclusion**:
- Therefore, the walls of an auditorium should be good sound absorbers to ensure optimum reverberation time and enhance the overall acoustic experience.

### Final Answer:
The walls of an auditorium should be good absorbers of sound.

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