Sound speed in Earth

Through the surface layers of the Earth, sound propagates 13 times faster than through air. The charge exploded 1.7 km from the measuring station during the geological survey. How long does it take between the vibration of the soil at the measuring point and the moment when an explosion is heard there? Speed of sound in air v2 = 340 m/s.

Correct answer:

t =  4.6154 s

Step-by-step explanation:

v2=340 m/s v1=13 v2=13 340=4420 m/s s=1.7 km m=1.7 1000  m=1700 m  t1=s/v1=1700/4420=1350.3846 s t2=s/v2=1700/340=5 s  t=t2t1=50.3846=4.6154 s

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