UltraSonic Waves? Ultrasonic waves are sound waves with frequencies high about human hearing and short wave lengths. Sound waves have frequencies about 20‚000 to 100‚000. Also Ultrasound frequencies range from 20 kHz (the upper range of hearing for a young adult human) through 150 kHz (audible to some bats and other creatures)‚ right up to 10 MHz (used in some medical treatments and industrial cleaning applications). While these frequencies overlap with those of radio waves‚ they are different because
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‘‘Wavelength‚ Frequency‚ Energy and Flame Color Produced by Different Metals’’ Period 8 October 30th 2013 October 24th 2013 Sosa #2 ABSTRACT: The purpose of this project was to identify the different flame colors that the different metals release‚ compare the flame colors with wavelength‚ compare the wavelength of different flames to their frequencies and energies‚ explain how the flames colors were produced‚ compare and contrast the results obtained in the lab with regard
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Figure 5.19 The mortar in unreinforced masonry walls such as these in Iran‚1990(A) can easily fail during an earthquake. Oftentimes the entire structure crumbles‚ leaving a pile of rubble in which survive. Shown in(B) is one of the many masonry homes to collapse during the 1988 Armenia earthquake (M6.9)‚ claiming nearly 25‚000 lives. The failure is called soft-story collapse. Soft-story collapse is a common problem in commercial building where the first floor has considerable open space for
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reflected wave. This system permits easy control of the reflection coefficient and eliminates feedback instability. Arbitrary reflection coefficients between almost 0 and about 1.5 have been realized in the frequency range from below 100 Hz to more than 800 Hz. Introduction The absorption of low-frequency sound is difficult with conventional‚ passive methods. Active (electroacoustic) methods are becoming more and more important. The state of entering into engineering practice has been reached especially
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controller) ABSTRACT: A new revolutionary microwave life detection system. Which is used to locate human beings buried (or) trapped under earthquake rubble has been designed. This system operating at certain frequency can remotely detect the breathing and heart beat signals of human beings buried under earthquake rubble. By proper processing of these signals‚ the status of the person under trap can be easily judged. The entire process takes place within a few
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An electrically driven vibrator was used to maintain a constant frequency. The string was not changed during the trials and thus‚ the mass per unit length‚ µ‚ remained constant. The frequency of the stroboscope was decreased from 179.96 Hz to 108 Hz in order to obtain the highest frequency at which the vibrator was gripped in position. The correct frequency of the vibration was 59.03 Hz. It was observed that the wavelength varies linearly with the square root
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set of frequencies. In normal basic telephone service‚ a pair of wires is used for communication. But in case of mobile/wireless communications‚ airwaves are used instead of wires. These spectrum/airwaves are licensed by the Government. It is allocated in Mega Hertz (MHz) in telecom licenses. 4.2 MHz is given as start-up spectrum‚ which is topped up by 1.8 MHz to make it 6 MHz (4.2 + 1.8 MHz)‚ and so on. 2) Why spectrum is called a scarce national resource? Worldwide different frequencies are used
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mechanical. Next‚ you will need a wide pan of water. Repeatedly dip your finger into the water to make a circular wave on the surface. What happens to the wavelength if you dip your finger more frequently? Describe what happens to wavelength as the frequency increases. Do not submit this journal entry yet. You will submit all of your journal entries at the end of this unit. Date your entry and save
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TABLE OF CONTENTS 1 BACKGROUND INFORMATION. 2 INSTRUMENTATION. 2 RECORDING PROCESSES. 2 REFERNCE TRACKS. 2 SESSION PLAN 1. Drum Track Listings. 3 Microphone Positioning. 3-4 SESSION PLAN 2. Bass Track Listings. 5 Microphone Positioning. SESSION PLAN 3. Guitar Track Listings. (Rhythm) 5 Microphone Positioning. SESSION PLAN 4. Guitar Track Listings. (Lead & Overdub) 6 Microphone Positioning. SESSION PLAN 5. Vocal Track Listings. 7 Microphone Positioning. SESSION
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Applied Acoustics 74 (2013) 1499–1510 Contents lists available at SciVerse ScienceDirect Applied Acoustics journal homepage: www.elsevier.com/locate/apacoust Transmission loss analysis of single-inlet/double-outlet (SIDO) and double-inlet/single-outlet (DISO) circular chamber mufflers by using Green’s function method Subhabrata Banerjee‚ Anthony M. Jacobi ⇑ Department of Mechanical Science and Engineering‚ University of Illinois at Urbana-Champaign‚ IL-61801‚ USA a r t i c l e
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