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abril (ama4294) - Homework Assignment 14 - kilic - (57110) This print-out should have 19 questions. Multiple-choice questions may continue on the

I need help on number 9 and 10 please.

abril (ama4294) – Homework Assignment 14 – kilic – (57110) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. Don’t Forget to hand in your ”show your work” problem to you TA. 001 10.0 points The Frequency range For a telephone is be- tween 500 and 4000 Hz. Why does a telephone not do a very good job oF transmitting music? 1. A telephone cuts o± the lower-Frequency overtones oF music that contribute to its qual- ity. 2. A telephone speaker has a bad quality. 3. Special earpieces can be used to allow you to enjoy music. 4. A telephone cuts o± the higher-Frequency overtones oF music that contribute to its qual- ity. 5. The small speaker cannot produce good music. 002 10.0 points A bat can detect small objects such as an insect whose size is approximately equal to one wavelength oF the sound the bat makes. IF bats emit a chirp at a Frequency oF 43 . 8 kHz, and the speed oF sound in air is 328 m / s, what is the smallest insect a bat can detect? Answer in units oF mm 003 10.0 points The greatest value ever achieved For the speed oF sound in air is about 10000 m / s produced at about 2 × 10 10 Hz. ²ind the wavelength oF this wave. Answer in units oF m 004 10.0 points A rock group is playing in a bar. Sound emerging From the door spreads uniFormly in all directions. The intensity level oF the music is 125 dB at a distance oF 2 . 53 m From the door. At what distance is the music just barely audible to a person with a normal threshold oF hearing? Disregard absorption. Answer in units oF m 005 10.0 points Heard at a certain distance, a car horn emits a sound with a loudness oF 50 dB. IF instead there were 100 identical cars all sounding their horns at this certain distance, how loud would the sound be? 1. still 50 dB 2. 5000 dB 3. 150 dB 4. 500 dB 5. 100 dB 6. 90 dB 7. 70 dB 8. 5 dB 006 (part 1 of 3) 10.0 points A mechanical high-speed bat is ³ying along a path perpendicular to a wall. It emits a sound with a Frequency f 0 . The night is clear and the air is still. Let the speed oF sound waves in the still air be v s . The bat hears a sound wave re³ected From the wall with a Frequency f new . ²rom this inFormation one can determine the speed v bat at which the bat is ³ying. Install a detector at the wall.
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abril (ama4294) – Homework Assignment 14 – kilic – (57110) 2 0 bat f v What is the detected frequency? 1. f 1 = v s + v bat v s f 0 2. f 1 = v s - v bat v s f 0 3. f 1 = 2 v s v s - v bat f 0 4. f 1 = f 0 5. f 1 = v s + v bat v s - v bat f 0 6. f 1 = 2 v s v s + v bat f 0 7. f 1 = v s - v bat v s + v bat f 0 8. f 1 = v s v s - v bat f 0 9. f 1 = v s v s + v bat f 0 007 (part 2 of 3) 10.0 points Now the reFected sound has a frequency f 1 and is moving towards the bat. What is the frequency f new which the bat hears? 1. f new = 2 v s v s + v bat f 1 2. f new = v s - v bat v s f 1 3. f new = v s - v bat v s + v bat f 1 4. f new = v s + v bat v s f 1 5. f new = v s v s - v bat f 1 6. f new = f 1 7. f new = v s v s + v bat f 1 8. f new = 2 v s v s - v bat f 1 9. f new = v s + v bat v s - v bat f 1 008 (part 3 of 3) 10.0 points Now assume the bat detects f new = 3 2 f 0 . What is the speed of the bat? 1. v bat = v s 2. v bat = 3 4 v s 3. v bat = 1 2 v s 4. v bat = 1 4 v s 5. v bat = 1 2 v s 6. v bat = 3 2 v s 7. v bat = 1 3 v s 8. v bat = 1 5 v s 009 (part 1 of 5) 10.0 points A student, standing near a straight road, records the sound of a car’s horn. The recorded frequency (as a function of the car’s position along the road) is plotted in the ±g- ure below. The same car made four trial runs along the road. Each trial was made with the car traveling at a constant speed. The four re- sults are plotted below, denoted by the curves F , N , Y , and P .
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