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- Oil explorers often set off explosives to make loud sounds, then listen for the echoes from underground oil deposits. Geologists suspect that there is oil under 520-m-deep Lake Physics. It's known that Lake Physics rests on top of solid granite. The speed of sound in water is 1480 m/s and the speed of sound in granite is 6000 m/s. a. If an explosion is created at the surface of the lake, what time after the explosion do the explorers expect to hear an echo from the bottom of the lake in seconds? t=0.703s b. In addition to the expected echo from the bottom of the lake, explorers also detect a faint echo 0.960 s after exploding the dynamite at the lake surface. If it's really oil, how deep will they have to drill through the granite to reach it in meters?If the sound waves produced by a speaker change to a much higher frequency, what would it sound like? O quieter O louder O lower in pitch O higher in pitch1) If you want to know the speed of a long-wavelength wave (e.g. tsunami or tide), you can use the shallow-water wave velocity equation v=gd where g is acceleration due to gravity (~10 m/s2), d is water depth (in meters), and v = speed (in meters per second). a) Calculate the speed of a tsunami (in meters per second), assuming an average ocean depth of 4000m. b) Convert the speed of a tsunami from meters per second to meters per hour (note that 1 hr = 3600 seconds). c) Convert the speed of a tsunami from meters per hour to miles per hour (note that 1 mile = 1600m).
- #8Question 25 Read the passage about echolocation. Echolocation is used by some animals, such as whales and bats, to find the location of objects by sending out sound waves through a medium. The length of time it takes for the sound wave to strike an object and bounce back tells the location of the object. How would the length of time it takes a sound wave to return to a whale differ from the time it takes a sound wave to return to a bat? А A sound wave would return faster to a bat because sound travels faster in air than it does in water. A sound wave would return faster to a bat because the wavelength is shorter in air than in water. A sound wave would return faster to a whale because sound travels faster in water than it does in air. A sound wave would return faster to a whale because the wavelength is longer in water than in air. ©2021 Illuminate Education TM, Inc. hp B.