7. The sound intensity 3 mi from the takeoff point of a Concord supersonic jet is 0.60 W/m². What area sound collector would absorb enough energy to run a 40-W lightbulb? [5]
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![7. The sound intensity 3 mi from the takeoff point of a Concord supersonic jet is 0.60 W/m². What
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- 2. A hiker shouts and hears the echo reflected from a cliff wall 4.00 s later. If the air temperature is 15°C, how far is the hiker from the cliff? (Assume no wind.) m 50 ssf60 ssr2. A hiker shouts and hears the echo reflected from a cliff wall 3.80 s later. If the air temperature is 20°C, how far is the hiker from the cliff? (Assume no wind.) m 2 W S X H 2 113 mand 3 E D . с $ 4 R F % 5 V T G 6 MacBook Pro B Y H 9 N U 00. 8 J I M ( 0. 9 K C O - V I дв H .C O L P command ill > **** x { E optionA microphone of surface area 2.0cm^2 absorbs 1.1mW of sound.what is the intensity of sound hitting the microphone
- 9. A plane seismic wave, travelling vertically downwards in a rock of density 2200 kg m-3 with seismic velocity 2000 m s-1, is incident on the horizontal top surface of a rock layer of density 2400 kg m-3 and seismic velocity 3300 m s-1. (a) What are the amplitude ratios of the transmitted and reflected waves? (b) What fraction of the energy of the incident wave is transmitted into the lower medium?Ultrasonic deep heating is accomplished by applying ultrasound of intensity 5.25 x 10³ W/m2 with a circular transducer having a radius of 3.10 cm. How long must this be applied for 1.00 kcal to be emitted? 264.11 X minUnder favorable conditions, the human eye can detect light waves with intensities as low as 2.50 × 10−12 W/m2. A) At this intensity, what is the average power incident on a pupil of diameter 8.20 mm in W B) If this light is produced by an isotropic source 15.5 m away, what is the average power emitted by the source? in W
- 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 QuestiThe electrical power needed to operate a speaker in your audio system is 18.7 W. If this speaker has a circular opening with a radius of 0.0743 m and the average sound intensity at the opening is 22.1 W/m2, determine the ratio of sound output power Psound to electrical input power Pelectrical. Psound PelectricalQUESTION 9 Two speakers emit incoherent sound waves into the open air. One of them produces 75W of power. A microphone is placed ata position that is 12m trom each speakers and it recelves a tota intensity of 0.25sw/m. What is the power output of the second speaker? O Need more info to solve. O 151 W O 377 W O38 W
- 10:26 0. A shop O O l 87% i AIATS For Two Year Medic. A 26 /180 Mark for Review The fundamental frequency of a sonometer wire increases by 6 Hz if its tension is increased by 44%, keeping length constant. Its original frequency is 20 Hz 25 Hz 30 Hz 60 Hz Clear Response II II6. You measure the intensity level of a sound wave 6 cm from its source (treat as a point source), and the result is 84 dB. What is the intensity of this sound wave? Answer:A bat flying at 10.0 m/s is chasing an insect flying in the same direction. The bat emits a 40.0 kHz chirp and receives back an echo at 40.2 kHz. How can you tell that the bat will catch the insect without performing any calculations?