A
Alexandria
Guest
can you solve any of these problems? show work please!
1.) You drop a stone into a deep well and hear the splash 2.5s later. How deep is the well? (ignore air resistance, and assume the velocity of sound is 340 m/s)
Answers: 29m,27m,25m,31m
2.) What is the intensity level of a sound with intensity 10^ -3 W/m²
Answers: 30dB,60dB,96dB,90dB
3.) A barking dog delivers about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00m from the dog?
Answers:65dB,63dB,61dB,68dB
4.) Sonar is used to determine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object moving?
Answers:6.9m/s,347 m/s,331 m/s, 8.4 m/s
5.) Two adjacent sources each emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sources would hear no sound?
Answers: 0.123 m, 0.321 m, 0.312m, 0.213m
thank you very much
i tryed over and over again and couldn't get the right answer
ignore question one, i have the answer.
i still need questions 2,3,4,and 5 please =]
1.) You drop a stone into a deep well and hear the splash 2.5s later. How deep is the well? (ignore air resistance, and assume the velocity of sound is 340 m/s)
Answers: 29m,27m,25m,31m
2.) What is the intensity level of a sound with intensity 10^ -3 W/m²
Answers: 30dB,60dB,96dB,90dB
3.) A barking dog delivers about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00m from the dog?
Answers:65dB,63dB,61dB,68dB
4.) Sonar is used to determine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object moving?
Answers:6.9m/s,347 m/s,331 m/s, 8.4 m/s
5.) Two adjacent sources each emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sources would hear no sound?
Answers: 0.123 m, 0.321 m, 0.312m, 0.213m
thank you very much
i tryed over and over again and couldn't get the right answer
ignore question one, i have the answer.
i still need questions 2,3,4,and 5 please =]