Damage to hearing is caused by sounds which exceed

Options

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

Answer

To determine the sound level that can cause damage to hearing, we need to analyze the options provided: 70 dB, 100 dB, 110 dB, and 120 dB.

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

2. **Identifying Dangerous Levels**: Research indicates that sounds above a certain threshold can cause hearing damage. Generally, sounds above 85 dB can be harmful with prolonged exposure.

3. **Evaluating the Options**:
- **70 dB**: This level is generally considered safe for hearing and does not cause damage.
- **100 dB**: This level can be harmful with prolonged exposure but is not immediately damaging.
- **110 dB**: This level is significantly loud and can cause damage with even short exposure.
- **120 dB**: This level is extremely loud and can cause immediate damage to hearing.

4. **Conclusion**: Based on the information, sounds exceeding **120 dB** can cause immediate and permanent damage to hearing.

Thus, the correct answer is **120 dB**.