| Ultrasonic sound | Infrasonic sound |
|---|---|
| I. Sound of frequency higher than 20,000 Hz is called ultrasonic sound. | I. Sound of frequency lower than 20 Hz is called the infrasonic sound. |
| II. Animals like dog, bat, monkey, deer, etc., can hear ultrasonic sound. | II. Animals like whale, elephant, hippopotamus, giraffe, etc., can hear infrasonic sound. |
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