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speed of sound

ppt5 , sound ,voice

ms10
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speed of sound

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  1. SPEED OF  SOUND STEDENTS NAMES: ﻲﻧاﺮﻬﺸﻟافﺎﻴﺳﻞﻳﺎﺻأ ﻲﻧﺎﻄﺤﻘﻟاﺮﻔﺴﻣﻲﻧﺎﻬﺗ ﻲﺛرﺎﺤﻟاﻲﺣﺎﻨﻣﻢﻳر يﺮﻣﺎﻌﻟاﻪﻓﻮﻠﺧسﺎﻨﻳر ﻲﻧاﺮﻬﺸﻟاﺮﻣﺎﻋﻰﻠﻴﻟ

  2. TABLE OF CONTENTS  • Mission Goal • Science Objectives • Technical Objectives • Science Background  • Principles of Sound     Propagation.    •Earth's Atmosphere    •Applications    •Previous Experiments    •Expected Outcomes

  3. MISSION GOAL •Measure the speed of sound in Earth's atmosphere in order to establish a relationship between speed of sound and altitude. • •Consider the effects of temperature and humidity on the speed of sound up to an altitude of 100,000 feet.

  4. SCIENCE OBJECTIVE Determine the general profile of temperature with altiude. Determine thre effects of humidity on the speed of sound . Determine the relationship between temperature and speed of sound. Measure the speed of sound with respect to altitude.

  5. TECHNICAL OBJECTIVE • Successfully reach an altitude of 100,000 feet. • Obtain accurate and precise measurements for speed of sound. •Measure temperature, pressure, and humidity.                                                                           •Withstand the atmospheric conditions such as low temperature and pressure. • Withstand the impact upon landing.

  6. PRINCIPLES OF SOUND PROPAGATION • Sound: Moving Pressure Wave in a Medium   -Disturbance or vibration must be made.  -Mechanical pressure wave Different wave.  -transformations depending on the medium. • Important Factors for Sound Waves in Gases.  -Temperature  -Gas composition

  7. EARTH'S ATMOSPHERE Troposphere -Surfece to= 20 km - Temperature decreases Stratosphere - 20 to 50 km - Temperature increases Mesosphere Thermosphere Exosphere

  8. APPLICATION  • SONIC DETECTION AND RANGING                                           • PROJECT MOGUL                          (SODAR)                                                                    ROSWELL UFO INCIDENT

  9. APPLICATION • Sound Navigation and Ranging (SONAR) -Active-Emits and receives pulses of sound. -Passive- Only receives sound pulses from external sources. •Ultrasound Doppler Vibrometer Detects buried land mines. •Huygens Probe Measured speed of sound on Titan

  10. PREVIOUS EXPERIMENTS Two microphones measure the time difference between sound waves. • Data were used to graph the relation between microphone separation and time difference.  • Equation and time difference from software can be used to obtain speed of sound.

  11. • Experiment by McNeese University Design Apparatus Measures the time difference between sound waves with two microphones Adjusted Data Points with Temperature

  12. EXPECTED OUTCOMES •Decrease in speed of sound until the balloon reaches the stratosphere • Increase in speed of sound in the stratosphere •Humidity is expected to play a minor role in determining the speed of sound when compared to temperature changes

  13. THANK YOU

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