Question

Earthquake produces __________ kind of sound before the main shock wave begins.(A) Infrasound (B) Ultrasound(C) Audible sound (D) none of these

Answer 1

The correct answer is option (A) Infrasound.

As the earthquake waves move through the Earth, the earth's surface acts as a speaker , emitting low frequency vibrations and transmits the earthquake's tumult in the air. Infrasound is used to detect earthquake, characterize volcanic eruptions. In humans, Infrasound results in changes in blood pressure and respiratory rates.

Answer 2

The correct answer is (A) Infrasound.

Earthquake produces infrasounds, kind of sound before the main shock wave begins.

Infrasound was first discovered after the destructive eruption of the Krakatoa in Indonesia (1883).

Sound waves below 20 Hz are inaudible for the human ear and these soundswaves are called infrasound.

Infrasounds are low frequency vibrations which help in detection of earthquakes.

Hope it helps!

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