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NCERT Exemplar Solutions Class 9 Science Solutions for Sound - Exercise in Chapter 12 - Sound
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An earthquake produces which kind of sound before the mainshock wave begins
(a) ultrasound
(b) infrasound
(c) audible sound
(d) none of the above
Answer:
The answer is (b) infrasound
Explanation:
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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