What is the range of frequencies associated with
(a) infra sound
(b) ultrasound ?

Explanation

To solve the question regarding the range of frequencies associated with infrasound and ultrasound, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Sound Frequency Ranges**:
- Sound can be categorized based on its frequency. The human ear can typically hear sounds in the frequency range of 20 Hz to 20 kHz (20,000 Hz).

2. **Identifying Infrasound**:
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