MPA 8 - MasteringPhysics: Assignment Print View

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Assignment 8 - Week 9 Due: 11:59pm on Friday, November 11, 2011 Note: To understand how points are awarded, read your instructor's Grading Policy . [ Switch to Standard Assignment View] Prob 20.47 Look at table 20.1 for speed of sound in different materials Problem 20.47 Oil explorers set off explosives to make loud sounds, then listen for the echoes from underground oil deposits. Geologists suspect that there is oil under 495-m-deep Lake Physics. It's known that Lake Physics is carved out of a granite basin. Explorers detect a weak echo 0.970 after exploding dynamite at the lake surface. Part A If it's really oil, how deep will they have to drill into the granite to reach it? ANSWER: 903 All attempts used; correct answer displayed m Problem 20.31 A concert loudspeaker suspended high off the ground emits 28.0 of sound power. A small microphone with a 0.800 area is 51.0 from the speaker. Part A What is the sound intensity at the position of the microphone? ANSWER: 8.57 × 10 4 Correct Part B How much sound energy impinges on the microphone each second? ANSWER: 6.85 × 10 8 Correct J Problem 20.33 MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrintVi. .. 1 of 7 11/24/11 11:32 AM
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What is the sound intensity level for sound wave of intensity 6.1 × 10 8 ? Express your answer using two significant figures. ANSWER: = 48 Correct Part B What is the sound intensity level for sound wave of intensity 6.1 × 10 2 ? Express your answer using three significant figures. ANSWER: = 108 Correct Problem 20.67 The sound intensity 47.0 from a wailing tornado siren is 0.100 . Part A What is the intensity at 1350 ? ANSWER: 121 Correct Part B The weakest intensity likely to be heard over background noise is . Estimate the maximum distance at which the siren can be heard. ANSWER: 14.9 Correct km Problem 16.80 A single mosquito 5.0 from a person makes a sound close to the threshold of human hearing (0 ). Part A
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MPA 8 - MasteringPhysics: Assignment Print View

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