The ocean floor is underlain by a layer of basalt that constitutes the crust, or

Question

The ocean floor is underlain by a layer of basalt that constitutes the crust, or uppermost layer, of the Earth in that region. Below this crust is found denser periodotite rock, which forms the Earth's mantle. The boundary between these two layers is called the Mohorovicic discontinuity ("Moho" for short). If an explosive charge is set off at the surface of the basalt, it generates a seismic wave that is reflected back out at the Moho. If the speed of this wave in basalt is 6.50 km/s and the twoway travel time is 1.85 s, what is the thickness of this oceanic crust?

Explanation / Answer

from the definition of velocity is rate of change of displacement

now here the total distance covered is 2d

now v= 2d/t   given time is for two way travel so

so d= v*t/2

      = 6.5*1.85/2=6.012 km

the thickness of this oceanic crust is 6.012 km

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