College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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During a thunderstorm, 3.1 s elapses between observing a lightning flash and hearing the resulting thunder. Approximately how far away in kilometers and miles was the lightning flash? (Assume the speed of sound is 344 m/s.)
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- Picnickers see a lightning flash and hear the resulting thunder 9.50 s later. If the storm is traveling at a rate of 19.0 km/h, how long, in minutes, do the picnickers have before the storm arrives at their location?arrow_forwardThe coldest recorded temperature of air on Earth, -128.6°F, occurred on July 21, 1983, at Vostok, a Russian station in Antarctica. What is the speed of sound in air at this temperature? m/sarrow_forwardthe sound intensity a certain distance from a sound source is 4.0x10^12 W/m^2. A change occurs in which there is a gain of 5.0 dB in the sound level. what is the sound intensity (in W/m^2) after the change occurs? express your answer as a multiple of 1.0x10^-11 W/m^2arrow_forward
- The area of a typical eardrum is about 5.0 × 10–5m2 . Calculate the sound power (the energy per second) incident on an eardrum at (a) the threshold of hearing and (b) the threshold of pain.arrow_forwardThe relationship between the number of decibles B and the intensity I in watts per square meteris denoted by the equation B = 10log(10^12 x I). If the intensity of a given sound is increased by a factor of 100, by how much does the number of decibels increase?arrow_forwardThe sound intensity of a jet engine, measured in watts per meter squared (W/m2), is inversely proportional to the square of the distance between the engine and an airport ramp worker. For a certain jet, the sound intensity measures 0.6 W/m2 at a distance of 8 meters from the ramp worker. What is the sound intensity (in W/m2) for a ramp worker 10 meters from the jet?arrow_forward
- The warning tag on a lawn mower states that it produces noise at a level of 96.0 dB. What is this in W/m²? W/m2arrow_forwardThe warning tag on a lawn mower states that it produces noise at a level of 99.0 dB. What is this in W/m2?arrow_forwardA car traveling due North at a4.1 m/S. A bicycist benind the car is traveling at 18.3 mis in the same dırection. The driver of the car blows her horn at 739 Hz. What frequency does the bicyclist hear? Sound Speed in air : 341 misarrow_forward
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