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5. Consider Lake Physics. It has an unknown depth and rests atop a strata of granite of unknown thickness. It is believed that a layer of Water sarface oil lies beneath the granite. Oil explorers set off explosives to make loud sounds, then listen for the echoes from underground oil deposits. The first echo will be at the water-granite interface, the second echo at the granite-oil interface. Lake botiom Granite After setting off the explosives, an echo is detected at the surface at 0.676 s, and then another echo at 0.900s. What is the minimum depth the oil explorers must drill to reach oil? : ou (You may need to look up the speed of sound in different media)

Answer 1

GraTe ˇ 5150 m/r 131 o66

0.676一0.224 S150 ol