Damage to hearing is caused by sounds which exceed
(a) 70 dB
(b) 100 dB
(c) 110 dB
(d) 120 dB

Options

A. 70 dB
B. 100 dB
C. 110 dB
D. 120 dB

Answer

To determine the level of sound that can cause damage to hearing, we need to analyze the options provided in the question.

1. **Understanding Decibels (dB)**:
- Decibels (dB) are a unit of measurement for sound intensity. The human ear can detect sounds ranging from 0 dB (threshold of hearing) to about 120 dB (threshold of pain).
- Sounds above a certain threshold can lead to hearing damage.

2. **Evaluating the Options**:
- **Option A: 70 dB**: This level is generally considered safe for hearing. Prolonged exposure can be annoying but is unlikely to cause damage.
- **Option B: 100 dB**: This is quite loud and can cause damage if exposure is prolonged. However, it is not the absolute threshold for hearing damage.
- **Option C: 110 dB**: This level is very loud and can cause damage to hearing with prolonged exposure.
- **Option D: 120 dB**: This is the maximum level of sound that the human ear can tolerate before pain and significant risk of hearing damage occurs.

3. **Conclusion**:
- Based on the analysis, sounds that exceed **120 dB** are likely to cause damage to hearing. Therefore, the correct answer is **(d) 120 dB**.