Question

How long does it take P-wave to travel through the Earth?
A)- 1 minutes
B)- 10 minutes
C)- 20 mins
D)- 5 mins

Answer 1

Hint:The P wave represents the depolarization of the left and proper atrium and moreover corresponds to atrial contraction. Strictly speaking, the atria contract a split 2nd after the P wave starts. In P or compressional waves, the vibration of the rock is inside the path of propagation. P waves tour fastest and are the primary to arrive from the earthquake.

Complete answer:
P-wave takes 16 to 20 minutes to tour through the Earth.
Seismic waves are of two types:- frame waves and floor waves. Frame waves have the potential to travel through the internal layers of earth frame waves are further categorized as p-waves which can be primary waves and S-waves which are secondary waves. P-waves:- that is the fastest form of seismic wave, and, therefore, the primary to 'arrive' at a seismic station.
Because of reality, the earth's mantle becomes greater rigid and compressible because the depth below the asthenosphere will increase, P-waves journey faster as they skip deeper inside the mantle. The density of the mantle also will increase with intensity below the asthenosphere. The higher density reduces the speed of seismic waves.
P-waves pass through each mantle and middle but are slowed and refracted at the mantle/center boundary at a depth of 2900 km. S-waves passing from the mantle to the center are absorbed due to the fact shear waves cannot be transmitted thru liquids.

Hence the correct answer is option C.

Note:P-waves and S-waves are frame waves that propagate through the planet. P-waves travel 60% quicker than S-waves on average due to the fact the indoors of the Earth do now not react in an equal manner to each of them. P-waves are compression waves that practice pressure inside the direction of propagation.