cannon is fired some distance away from you, and you wish to estimate that distance by determining how much sound energy enters your ear. (a) How does the sound energy depend on the distance between the cannon and your ear? (b) Now you use the dependence you described in part a to judge how far away the cannon is. First you estimate the distance assuming that none of the energy in the sound waves is dissipated (into, say, random motion of the molecules that make up the air), and then you repeat the estimate assuming that some of the sound energy is dissipated. Is your first estimate higher or lower than your second estimate?

cannon is fired some distance away from you, and you wish to estimate that distance by determining how much sound energy enters your ear. (a) How does the sound energy depend on the distance between the cannon and your ear? (b) Now you use the dependence you described in part a to judge how far away the cannon is. First you estimate the distance assuming that none of the energy in the sound waves is dissipated (into, say, random motion of the molecules that make up the air), and then you repeat the estimate assuming that some of the sound energy is dissipated. Is your first estimate higher or lower than your second estimate?

Similar questions

The ability to hear a "pin drop" is the sign of sensitive hearing. Suppose a 0.53 g pin is dropped from a height of 31 cm, and that the pin emits sound for 1.4 s when it lands. Part A Assuming all of the mechanical energy of the pin is converted to sound energy, and that the sound radiates uniformly in all directions, find the maximum distance from which a person can hear the pin drop. (This is the ideal maximum distance, but atmospheric absorption and other factors will make the actual maximum distance considerably smaller.) Express your answer using two significant figures. Hνα ΑΣφ ? r = km
(a) To appreciate the human ear’s twelve order of magnitude (10^12) span from barely audible to the pain threshold, consider the following. Suppose an equivalently dynamic instrument were designed to measure distances. Taking the lower limit of the instrument to be 1.00 mm, what would be the largest distance measurable? (b) To provide a perspective for the human ear’s frequency sensitivity range (audible frequency extremes differ by 10^3 ), consider a speedometer with a similar speed range. If the speedometer’s maximum speed reading is 90.0 mi/h, what is the smallest finite speed that it could register?
Consider an omnidirectional mobile robot with a ring of twelve ultrasonic sensors (each with an opening angle of 30o) that are fired sequentially. Calculate the slowest scan rate in Hz (i.e. number of full 360o scans per second) if the furthest object of interest is 4m away at any given time. Give your answer to 2 decimal places. Assume the speed of sound in air is 343 m/s.
Party hearing. As the number of people at a party increases, you must raise your voice for a listener to hear you against the background noise of the other partygoers. However, once you reach the level of yelling, the only way you can be heard is if you move closer to your listener, into the listener's "personal space." Model the situation by replacing you with an isotropic point source of fixed power Pand replacing your listener with a point that absorbs part of your sound waves. These points are initially separated by r = 1.10 m. If the background noise increases by Aß = 4.50 dB, the sound level at your listener must also increase. What separation rț is then required? Number i Units
Using the sound level versus frequency plot with equal-loudness curves shown below, calculate the intensity in W/m2 for the 10,000-Hz sound having a loudness of 80 phons. (Use your estimate)
(a) To appreciate the human ear’s twelve order of magnitude (1012) span from barely audible to the pain threshold, consider the following. Suppose an equivalently dynamic instrument were designed to measure distances. Taking the lower limit of the instrument to be 1.00 mm, what would be the largest distance measurable? (b) To provide a perspective for the human ear’s frequency sensitivity range (audible frequency extremes differ by 103 ), consider a speedometer with a similar speed range. If the speedometer’s maximum speed reading is 90.0 mi/h, what is the smallest finite speed that it could register?
A spectator at a parade receives an 889 Hz tone from an oncoming trumpeter who is playing an 879 Hz note. At what speed vs, is the musician approaching if the speed of sound is 340 ms?
Determine the frequency response [M(w) and (w)] for an instrument having a time constant of 10 ms. Estimate the instrument's usable frequency range to keep its dynamic error within 10%.