2. Calculate the fraction of reflected ultrasound energy when ultrasound waves cross from soft tissue into fat if the acoustic impedance for soft tissue is 1.60 x 106 kg m² s¹ and for fat has the value 1.40 x 106 kg m-² s-¹.
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- A Doppler blood flow meter unit emits ultrasound at 4.1MHz.What is the measured blood speed if the flow meter records a frequency shift of 1.6 kHz?Use the speed of ultrasound in human tissue. (1540 m/sec through tissue)1. Like most dolphins, "Sparky the Wonder Dolphin" uses echolocation (or sonar) by emitting high frequency "clicks" to locate objects in the water around her. Typical frequency of a dolphin's sonar click is 100 kHz, while the typical intensity of a sonar click at a distance of 1 m from a dolphin's head is 200 dB. The speed of sound in sea water is about 1520 m/s. If Sparky emits a sonar click that bounces off a school of tuna 20 km distant, a) how long must she wait to hear the reflected pulse, and b) what is the intensity in dB of the reflected pulse that she hears?5. What is the intensity of a sound that has an intensity level of 95 dB? ssfoc s W/m2 ssf60 ssk 60 ssf60 sst ssf60 ssf60 09 0 ssfoo
- 54. 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 dB2. 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 911Calculate the fraction of reflected ultrasound energy when ultrasound waves cross from soft tissue into fat if the acoustic impedance for soft tissue is 1.60 x 106 kg m-2 s-1 and for fat has the value 1.40 x 106 kg m-2 s-1
- 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?An interface is formed between a block of aluminium (with an acoustic impedance of 1.8 x 107 kg m2 s') and a block of copper (with an acoustic impedance of 4.6 x 107 kg m-2 s-1). Longitudinal sound waves travelling through the aluminium are normally incident on the boundary, and are partially reflected. a) What is the ratio of the amplitude of the reflected wave to that of the incident wave? Number b) What is the ratio of the amplitude of the transmitted wave to that of the incident wave? Number c) What percentage of the incident power is transmitted? Number d) What percentage of the incident power is reflected? Number % Ouit P Sove Questiq5
- 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.Part B A52-dB sound wave strikes an eardrum whose area is 5.0 x 10m The intensity of the reference level required to determine the sound level is 1.0 x 10-1 W/m 1 yr 3.156 x 107s At this rate, how long would it take the eardrum to receive a total energy of 1.0 J? Express your answer using two significant figures. ΑΣΦ t 3D yr Submit Request Answer Previous の hp hp f5 f6 f7 f8