The average density of Earth's crust 10 km beneth the surface is2.7gm/cm3 The speed_of longitudinal seismic waves at that depth is 5.4 km/s The bulk modulus of earth's crust Its considering its behaviour as fluid at that depth Is:
A
7.9×1010Pa
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B
5.6×1010Pa
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C
7.9×107Pa
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D
1.46×107Pa
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Solution
The correct option is A7.9×1010Pa Accordingtoquestion...............Thewavespeedisv=(B/μ)1/2orB=μV2=(2.7g/cm3)×(5.4km/s)2=7.9×1010Pa.sothecorrectoptionisA.