MCQ
Some animals get disturbed and start running here and there just before the earthquakes occur because they can hear______________?
- ✓Infrasonic sounds
- BUltrasonic sounds
- CAudible sounds
- DNone of these
✓
Answer
Correct option: A.
Infrasonic sounds
An earthquake produces infra-sound before the main shock wave. Infra-sound is a low-frequency sound. It is sound that is lower in frequency than $20\ Hz$ (hertz) or cycles per second, the normal limit of human hearing. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infra-sound, the sound pressure must be sufficiently high.
Rhinos have extremely good ears, picking up infra-sound far deeper than the range of human hearing.
Rhinos can hear down to a frequency of four hertz, whereas even a human baby, with entirely undamaged ears, can normally only pick up sounds as low as $20\ hertz.$ Giraffes and elephants can also hear in this infra-sound range.
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