Sound Waves: Infrasound and Ultrasound MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Infrasound and UltrasoundHardQuestion 31285

Question

Infrasound (f < 20 Hz) is used to detect:

A
Submarines (SONAR)
B
Bat navigation
C
Volcanic eruptions and earthquakes at long distances
Correct
D
Medical imaging

Correct answer

Volcanic eruptions and earthquakes at long distances

Explanation

Infrasound travels vast distances with little attenuation. Earthquakes, volcanoes, and severe storms generate infrasound. Arrays of microbarometers can detect eruptions thousands of km away.

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