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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 behaviour as fluid at that depth, is

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a

7.9×107Pa

b

7.9×1010Pa

c

1.46×107Pa

d

5.6×1010Pa

answer is A.

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Detailed Solution

v=Bρ⇒B=v2ρ=5.40×103m/s22.7×103=7.9×1010Pa

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