The following level of sound may damage ear drum and can umpire the hearing ability permanently

Options

A. 80 dB
B. 100 dB
C. 120 dB
D. 150 dB

Answer

To determine which level of sound can permanently damage the eardrum and impair hearing ability, we need to analyze the given options in terms of their decibel (dB) levels.

### Step-by-Step Solution:

1. **Understanding Decibels (dB)**:
- Decibels are the unit of measurement for sound intensity. The higher the dB level, the louder the sound.

2. **Identifying Dangerous Levels**:
- Sounds at levels of 80 dB and 100 dB are considered loud but typically do not cause permanent damage with brief exposure.
- Sounds at 120 dB are extremely loud and can cause immediate harm with prolonged exposure.

3. **Recognizing Extremely High Sound Levels**:
- Sounds at 150 dB are considered extremely high and can cause severe damage to the eardrum (tympanic membrane) and lead to permanent hearing loss.

4. **Conclusion**:
- Among the given options (80 dB, 100 dB, 120 dB, and 150 dB), the sound level that can permanently damage the eardrum and impair hearing ability is **150 dB**.

### Final Answer:
The level of sound that may damage the eardrum and can impair hearing ability permanently is **150 dB**.

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