At a distance of 12 km, a 213 Hz horn, assumed to be an isotropic point source, is barely audible. At what distance would it begin to cause pain?At a distance of 12 km, a 213 Hz horn, assumed to be an isotropic point source, is barely audible. At what distance would it begin to cause pain?
At a distance of 12 km, a 213 Hz horn, assumed to be an isotropic point...
6)Two adjacent natural frequencies of an organ pipe are determined to be 912 Hz and 1008 Hz. (Assume the speed of sound is 343 m/s.) (a) Calculate the fundamental frequency of this pipe. Answer must be in Hz (b) Calculate the length of this pipe. Answer must be in m 7)A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 60 dB by an observer 10 km away. (a) What...
Someone plans to float a small, totally absorbing sphere 0.532 m above an isotropic point source of light, so that the upward radiation force from the light matches the downward gravitational force on the sphere. The sphere's density is 20.8 g/cm3, and its radius is 2.34 mm. (a) What power would be required of the light source? (b) Even if such a source were made, would the support of the sphere be unstable? Assume that the speed of light is...
A point source of sound generates a 200 Hz tone. The wave has an intensity of 2.2×10−8 W/m2 at a distance of 3 m from the source. Find the total sound power at the source. At what distance from the source is the decibel level below 15 dB? What is the intensity of the sound at this distance?
4 A point sound source emits a sinusoidal wave at a frequency of 2,000 Hz. The pOwer of the sound at the source is 10 watt. What are: the sound intensity, the sound intensity level and the loudness of that sound at (a) a distance of Im from the source? (b) at a distance of 2m from the source?
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111 w (a) Find the intensity 10.7 m from the source W/m2 (b) Find the intensity level in decibels at that distance. dB (c) At what distance would you experience the sound at the threshold of pain, 120 dB? Need Help? Read 11. -/2 points SerCP10 14 P023 My No A commuter train passes a passenger platform at a constant speed of 42.1 m/s. The...
A long, lossless, three-phase transmission line is operating with 60 Hz with a nominal voltage of 400 kV. The distance between sending and receiving sides of the line is 350 km and the line’s series inductance and shunt capacitance per length per phase are 0.92 mH/km and 0.016µF/km, respectively. If the line delivers 667.2461 MW at 400 kV with unity power factor at its receiving side, what would be the line-line voltage magnitude in the middle of the line?
One foggy morning, when the temperature of t he air was 19 degrees calcius, Kenny is driving his speed boat toward the Brant Point Lighthouse at a speed of 15 m/s as the fog horn blows with a frequency of 180 Hz. What frequency does Kenny hear as he moves?
An electronic point source emits sound isotropically at a frequency of 2 × 103 Hz and a power of 27 watts. A small microphone has an area of 0.77 cm2 and is located 175 meters from the point source. a: How many minutes will it take for the microphone to recieve 0.2 Joules from this sound? b: What is the sound intensity level at the microphone from this point source? c: What would be the sound intensity level at the...
A runner leaves a starting point and jogs 25 km north and then 18 km east to reach the finish. If the runner had taken a straight path from the start to the finish, what distance would he have jogged? none of these is correct O 95 kilometers O 31 kilometers 43 kilometers O 7 kilometers
An airplane flying at a distance of 7.9 km from a radio transmitter receives a signal of intensity 12 uW/m2. What is the amplitude of the (a) electric and (b) magnetic component of the signal at the airplane? (c) If the transmitter radiates uniformly over a hemisphere, what is the transmission power? (a) Number Units (b) Number Units (c) Number Units Open Show Work Click if you would like to Show Work for this question: