Earthquake produces which kind of sound before the main shock wave begins (a) ultrasound (b) infrasound (c) audible sound (d) none of the above
ScienceClass 9CBSEAnswered 27 Mar 2026
Answer
Soln:
Answer is (b) infrasound
Explanation:
It is due to infrared rays few animals sense the earthquake and they behave abnormally before earthquake.
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