3. By how many decibels do you reduce the sound intensity level due to a source of sound if you triple your distance from it? Assume that the waves expand spherically. dB
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- M554. What is the intensity in decibels of a 20 Watt speaker at 50 meters away? Intensity = Power/ Area of Sphere A. 88 dBB. 94 dBC. 98 dBD. 104 dBIn an acoustics lab you have a 120 m long pipe containing very cold air. Suppose that using a speaker you cause a sinusoidal wave of sound with frequency 150 Hz and wavelength 1.9 m to travel down the pipe. i)How long does it take for your sinusoidal wave to travel from one end of the pipe to the other end of the pipe? ii)What is the temperature of the air in the pipe?
- 2. A spherical source radiates sound uniformly in all directions. At a distance of 11 m, the sound intensity level is 94 dB. What power is radiated by this source? W cei16 cei16. 116 cci16 cei ceil6 ccil6⁹ to the the 9113. Two loudspeakers emit sound waves along the r-axis. A listener in front of both speakers hears a maximum sound intensity when speaker 2 is at the origin and speaker 1 is at r = 0.50 m. If speaker 1 is slowly moved forward, the sound intensity decrcases and then increases, reaching another maximum when speaker 1 is at x = 0.90 m. a. What is the frequency of the sound? Assume vsound = 340 m/s. b. What is the phase difference between the spcakers?13.A vibrating tuning fork with a frequency of 324 Hz is held over a tube of air whose length canbe adjusted by raising and lowering a column of water in the tube. The starting length of thecolumn of air is very short and letting the water out slowly gradually lengthens it. If the speedof sound in air is 336 m/s, how long is the column of air when the first constructive interferenceis heard.
- In an acoustics lab you have a 60 m long pipe that contains very cold air, in fact T = – 46 °C. Suppose that using a speaker you cause a sinusoidal wave of sound with wavelength 1.5 m to travel down the pipe, going from one end of the pipe to the other. ii) What is the frequency of the sound in the pipe? a) 1.5×102 Hz b) 2.0×102 Hz c) 2.5×102 Hz d) 3.0×102 Hz e) 3.5×102 Hz18. Suppose you are building a new house. While installing the hot water pipe to the shower, you can't find your tape measure. To measure the pipe, you close the bottom with your finger and blow across the top. You hear a loud resonance with frequency f = 282.1 hz (cycles/second). Since sound is a longitudinal wave, there must be a node at the closed bottom and an antinode at the top. Calculate the length of the pipe. The velocity of sound in the air is 340.0 m/s.B6
- W S # JO E X 3 5. By how many decibels do you reduce the sound intensity level due to a source of sound if you quadruple your distance from it? Assume that the waves expand spherically. X 40 dB 4 C 25 868 R % 5 FS DEC V T tv 6 MacBook Air B F6 H & 7 F7 8 N انات 9 M K MOSISO zoom P CU command 1 option2. Emma needs to know the fundamental frequency of a guitar string. She sounds the string together with an 840Hz tuning fork, and counts 15 beats in 5.0s. She then sounds the string with an 835Hz tuning fork and counts 2 beats every second. What is the frequency of the string?2. Two boys are whispering in the library. The radiated sound power from one boy's mouth is 1.2 × 10-9 W and it spreads out uniformly in all directions. What is the minimum distance the boys must be away from the librarian so that she will not be able to hear them? The threshold of hearing for the librarian is 1.00 x 10-12 W/m².