We are not able to hear the sounds produced by earthquake waves and
dolphins both though they have a wide frequency difference. Comment.
Answers
Answer:
ans A
Explanation:
Answer is A.
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.
Hence, we can see some animals get disturbed and start running here and there just before the earthquakes because they can hear infrasonic sound.
the answer of the above question is A