A frequency of _____ is not audible to human beings

Options

A. 100Hz
B. 18000Hz
C. 20000Hz
D. 22000Hz

Answer

To solve the question "A frequency of _____ is not audible to human beings," we need to determine which of the given options falls outside the audible range for humans.

### Step-by-Step Solution:

1. **Understand the Human Audible Range**: The typical range of frequencies that humans can hear is from 20 Hz to 20,000 Hz (20 kHz).

2. **Analyze the Options**:
- **Option A: 100 Hz**: This frequency is within the audible range (20 Hz to 20,000 Hz).
- **Option B: 18,000 Hz**: This frequency is also within the audible range.
- **Option C: 20,000 Hz**: This frequency is at the upper limit of the audible range.
- **Option D: 22,000 Hz**: This frequency is above the audible range.

3. **Identify the Frequency Not Audible**: Since 22,000 Hz is above 20,000 Hz, it is not audible to human beings.

4. **Conclusion**: Therefore, the correct answer is **Option D: 22,000 Hz**.

### Final Answer:
A frequency of **22,000 Hz** is not audible to human beings.

---