8. A loudspeaker emits sound waves isotropically (uniformly in all directions). Listener number one, at distance R, = 20.0m, hears sound with an intensity (in decibels) B = 85.0dB. a.) What is the average acoustic power, P delivered by the loudspeaker? b.) At what distance, R,, from the speaker would the sound intensity be 6, = 52.5 dB?
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- Loudness (L), in decibles (dB), of a sound of intensity I is defined to be L=10log( I/I0), where I0=10-12(W/M2) (watts per meter square) is the minimum intensity detectable by the human ear. A.) Find the loudness L, in decibles (dB), of a trombone given the intensity is 1010I0 B.) Find the intensity of a rock concert whose loudness is 115 decibles. C.) What is the NIOSH recommended Exposure Limit (REL) given in dB based on exposures at work 5 days per week?A student hears a sound with a power of P = 42 μW. At their distance from the source, the sound has intensity I = 0.71 W/m2. A. Assuming the eardrum is circular, what is the radius of their eardrum, in meters? B. Another student stands in the exact same location, but receives 20% more power from the same source. What is the radius of the second student's eardrums?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 911
- Q3: A 1.0 W point source emits sound waves isotopically. Assuming that the energy of the waves is conserved, find the intensity (a) 1.0 m from the source and (b) 2.5 m from the source. (Hint: the area of the sphere is 4ar')The softest sound a human ear can hear is at 0 dB (Io = 10-12 W/m2). Sounds above 130 dB cause pain. A particular student's eardrum has an area of A = 51 mm^2. a. What is the most power, in watts, the ear can receive before the listener feels pain? b. What is the smallest power, in watts, the ear can detect?The fundamental frequency of an organ pipe, closed at one end, is 286.3 Hz. What should the length of this organ pipe be (in cm)? Speed of sound in air at T = 20.0°C is 343 m/s. What is the fundamental frequency of this organ pipe if the temperature drops to 4.50°C?
- The speed of sound in air is 340 m/s, and the density of air is 1.20 kg/m³. If the displacement amplitude of a 510.0-Hz sound wave is Pa 14.0 μm, what is its pressure-variation amplitude? iThe two successive harmonic frequencies of a 0.45 m long sound pipe are 929 Hz and 1300 Hz. a) Is the pipe open at both ends or only at one end? b) What is the propagation speed of the wave?Thank you! The fundamental frequency of an organ pipe, closed at one end, is 258.3 Hz. a) What should the length of this organ pipe be? Speed of sound in air at T= 20.0°C is 343 m/s b) What is the fundamental frequency of this organ pipe if the temperature drops to 5.20°C?
- A.) I have an open-closed tube with a length of 0.7 m and a radius of 0.5 cm. What is the wavelength of mode number 2, in m? B.) I have an open-open tube with a length of 0.7 m and a radius of 1.6 cm. What is the frequency of mode number 1, in Hz? The speed of sound is 343 m/A piccolo and a flute can be approximated as cylindrical tubes with both ends open. The lowest fundamental frequency produced by one kind of piccolo is 544.3 Hz, and that produced by one kind of flute is 263.8 Hz. What is the ratio of the piccolo's length to the flute's length?A piccolo and a flute can be approximated as cylindrical tubes with both ends open. The lowest fundamental frequency produced by one kind of piccolo is 587.3 Hz, and that produced by one kind of flute is 261.6 Hz. What is the ratio of the piccolo's length to the flute's length?