Ultrasound has frequency of vibration

Options

A. between 20 and 20,000 Hz
B. below 20 Hz
C. above 20,000 Hz
D. between 500 and 10,000 Hz

Answer

**Step-by-Step Solution:**

1. **Understanding Ultrasound**:
- Ultrasound refers to sound waves that have a frequency higher than what the human ear can detect.

2. **Defining Frequency Ranges**:
- Sound can be categorized based on its frequency into three main types:
- **Infrasonic**: Frequencies below 20 Hz (not audible to humans).
- **Audible**: Frequencies between 20 Hz and 20,000 Hz (can be heard by humans).
- **Ultrasonic**: Frequencies above 20,000 Hz (not audible to humans).

3. **Identifying the Frequency of Ultrasound**:
- By definition, ultrasound has a frequency greater than 20,000 Hz.

4. **Conclusion**:
- Therefore, the frequency of ultrasound is anything above 20,000 Hz.

**Final Answer**: The frequency of ultrasound is greater than 20,000 Hz.

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