NCERT Exemplar Solutions Class 9 Science Solutions for Sound - Exercise in Chapter 12 - Sound

Question 7 Sound - Exercise

An earthquake produces which kind of sound before the mainshock wave begins

(a) ultrasound

(b) infrasound

(c) audible sound

(d) none of the above


The answer is (b) infrasound


It is due to infrared rays few animals since the earthquake and they behave abnormally before the earthquake.

Video transcript
"hello everyone welcome to leader learning i'm good greek your science tutor today's question is an earthquake produces which kind of sound before the main shock vape begins so a ultrasound b infrasound c audible sound or d none of these so out of the four options given we have to find out which will be the correct one so when the earthquake is about to to begin it produces infrared sound or rays which few animals can feel and detect and hence start to behave abnormally so the correct option for the waves which are produced before the earthquake are that is b infrared sun infrasound is the correct option for the question for more such videos please subscribe leader learning and for any doubts drop a comment thank you"
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