The loudness of a sound that a person can withstand without discomfort is about

Options

A. 150 db
B. 215 db
C. 30 db
D. 80 db.

Answer

To solve the question regarding the loudness of sound that a person can withstand without discomfort, we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Decibels**:
- Decibels (dB) are a unit used to measure the intensity of sound. Different sounds have different decibel levels, and these levels can indicate how comfortable or uncomfortable a sound may be for a person.

2. **Identify the Decibel Levels for Different Sounds**:
- Common sound levels include:
- 30 dB: Whisper
- 60 dB: Normal conversation
- 80 dB: Loud sound (e.g., heavy traffic)
- 95 dB and above: Levels that can cause discomfort and are considered noise pollution.

3. **Analyze the Options Given**:
- The options provided are:
- A) 150 dB
- B) 215 dB
- C) 30 dB
- D) 80 dB
- From the previous step, we know that 30 dB is too low (whisper), while 150 dB and 215 dB are excessively high and would cause significant discomfort.

4. **Determine the Threshold for Discomfort**:
- Based on the analysis, 80 dB is the level where sounds start to become uncomfortable for most people. It is above normal conversation levels (60 dB) and is recognized as a threshold for discomfort.

5. **Conclude the Answer**:
- Therefore, the loudness of sound that a person can withstand without discomfort is **80 dB**. This corresponds to option D.

### Final Answer:
**D) 80 decibel**

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