A group of hikers hears an echo 4.00 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 341 m/s.) m
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- The 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/sA group of hikers hears an echo 4.20 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 341 m/s.)A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 7.69 104 Hz, and if the speed of sound in air is 343 m/s, what is the smallest insect a bat can detect? ?mm
- A group of hikers hears an echo 3.60 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 342 m/s.)A group of hikers hears an echo 3.40 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 341 m/s.)A bat flying in a cave emits a sound and receives its echo 0.09 s later. Find the distance to the wall of the cave. Express your answer to two significant figures and include the appropriate units.
- A bullet is fired and moves at a speed of 1342 mph. Assume the speed of sound is v = 340.00 m/s. What is the angle of the shock wave produced?The light intensity (1.006x10^2) cm from a point source is (1.4794x10^0) kW/m². What is the intensity (3.73221x10^2) m away from the same source? Express your result with four significant figures in W/m2.and 4.00 m from the other? Ans. 4.1 rad 7. A bat flies toward a wall at a speed of 5.0 m/s. As it flies, the bat emits an ultrasonic sound wave with frequency 30 kHz. What frequency does the bat hear in the reflected wave? 8 The solution of travelling wave v(cos(kx - wt) is Ans. 30,888 kHz w²0²y a²y
- 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/m2During a thunderstorm, 5.9 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.)a noise level meter reads the sound level in a room to be 85 dB. What is the intensity of sound in W/m^2?