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Q.

How long does it take a P-wave to travel through the Earth?


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a

1 minutes

b

10 minutes

c

20 mins

d

5 mins 

answer is C.

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Detailed Solution

P-wave travels across the globe in 16 to 20 minutes.
P-waves move more quickly the deeper they go into the mantle. At the mantle/centre border, which is located at a depth of 2900 km, P-waves are slowed and refracted after passing through each mantle and middle.
Thus. 3  is the correct answer.
 
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