bigsaucy
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Hi all, quick problem I'm having trouble with.
Oil explorers set off explosives to make louds sounds, then listens for the echoes from underground oil deposits. Geologists suspect that there is oil under 500-m deep lake physics. It's known that lake physics is carved out of a granite basin. Explorers detect a weak echo 0.94s after exploding dynamite at the lake surface. If it's really oil, how deep will they have to drill into the granite to reach it?
i reasoned that since the speed of sound in water is 1480 m/s and it takes (0.94/2) or 0.47 seconds to reach the oil bed, that the sound wave from the explosion travels 695.6m which is 195.6m from the granite basin. the book says the answer is 760m
Oil explorers set off explosives to make louds sounds, then listens for the echoes from underground oil deposits. Geologists suspect that there is oil under 500-m deep lake physics. It's known that lake physics is carved out of a granite basin. Explorers detect a weak echo 0.94s after exploding dynamite at the lake surface. If it's really oil, how deep will they have to drill into the granite to reach it?
i reasoned that since the speed of sound in water is 1480 m/s and it takes (0.94/2) or 0.47 seconds to reach the oil bed, that the sound wave from the explosion travels 695.6m which is 195.6m from the granite basin. the book says the answer is 760m