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Q.

The average density of Earth's crust 10 km beneath the surface is 2.7 gm/cm3. The speed of longitudinal seismic waves at that depth is 5.4 km/s. The bulk modulus of Earth's crust considering its behavior as fluid at that depth, is:

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a

7.9 × 1010 Pa

b

5.6 ×1010 Pa

c

7.9×107 Pa

d

1.46×107 Pa

answer is A.

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Detailed Solution

V = Bρ   ⇒B = V2ρ= (5.40×103m/s)2(2.7×103)= 7.9×1010 Pa
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