Ben is walking in a park in a straight line at 1.2 m/s. A bird is hiding in a bush. When Ben is closest to the bush, he is 2 m away from the bird and he hears a 10 dB sound. How long will he continue to hear the bird?
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- An organ pipe that is 1.75 m long and open at both ends produces sound of frequency 303 Hz when resonating in its second overtone. What is the speed of sound in the room? m/sand 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 a²yThe long, slow moan that blue whe long, slow moan that blue whales produce is commonly measured as 16.02 hz. suppose that a marine biologist is trying to measure this in a submarine that is approaching the whales at a speed of 50.0 m/s. the speed of sound in sea water is 1560 m/s. what is the frequency of sound observed by the marine biologist in the submarine?
- The warning tag on a lawn mower states that it produces noise at a level of 99.0 dB. What is this in W/m2?Deep underwater, a sub moves through still water at a speed of 23 m/s. The sub sends out a 910 Hz sonar wave towards an underwater mountain. The wave reflects off the mountain and the sub detects the reflected wave. (The speed of sound in water is 1482 m/s.) Hint: this problem requires two parts. The sub is the source for the initial wave. The frequency does not change when the wave reflects from the mountain. For the reflected wave, the sub is the detector. What frequency does the sub detect for the reflected wave?A sound has an intensity of 150 W/m2 at a distance of 8.50 m from the source. What is the power of the wave at its source? At what distance will its intensity drop to 1W/m2?
- As part of a college physics lab. A car that is giving off a sound with a frequency of 350 Hz, is moving towards a group of students that are standing together (not moving). The students measure the sound coming from the car as 385 Hz. What is the speed of the car?A 38.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 38.0-Hz sound wave? What is the ratio of the displacement amplitude to the average distance between molecules in air at room temperature, about 3.00 nm?A submarine is moving toward another submarine at 9.2 m/s. it emits a 3.5 MHz ultrasound. What frequency would the second sub, at rest, detect? The speed of sound in water is 1482 m/s.
- A physics student walks down a long hall carrying a vibrating 360.0 Hz tuning fork. The end of the hall is closed so that the sound reflects from it. The student hears 5.0 beats per second. How fast is the student walking? Assume that the velocity of sound is 342.0 m/s.30 m from an ultrasonic sensor. The total travel time of the ultrasonic wave is 33 ms (milliseconds). What is the speed of sound in these conditions?Early Doppler shift experiments were conducted using a band playing music on a train. A trumpet player on a moving railroad flatcar plays a 320-Hz note. The sound waves heard by a stationary observer on a train platform hears a frequency of 350 Hz. What is the flatcar’s speed in mph? The temperature of the air is TC = 22°C .