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SOUNDS

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Published in: Physics
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  1. SOUND
  2. Sound can be pass through solid , liquid or gas Sound cannot pass through vaccum The scientist who proved that the sound cannot pass through the vaccum was robert boyle.
  3. LONGITUDINAL WAVES & TRANSVERSE WAVES If the particle of amedium vibrate in adirection ,llel to or along the dire tion of propogation of wave is called longitudinal waves.
  4. WAVES If the particles of the medium vibrate in a direction , perpendicular to the direction of propogation of wave is called trans verse waves .
  5. Sound waves in air or gas travel in the form of longitudinal waves , Longitudinal wave propogate in a medium is the form of compression and rarefactiom The area with maximum pressure is a called compression The area with minimum pressure is called rarefaction
  6. 01 . Amplitude 02. Frequency
  7. Higher Amplitude lower Amplitude Higher Amplitude lower Amplitude Maxi um displa e ment f a partic e from he mean positi n is cal ed ampli ud Loudness of so nd depe dS on th ampli ud Unit of ampli ud
  8. FREQUENCY(HZ) Short wavelength - High frequency Long wavelength - Low frequency The human ear c n hear the range o audible frequenc es between 20 hz t 20,000 hz known as audible frequenc The human ear cannot hear the range of audible frequency below 0 hz and above 20 00 hz known as audi le sound . Sound waves of frequencies abov 20000 hz are call d ultrasonic waves
  9. 1 speed of light = 3*10A8 m/s 2 speed of sound = 340 m/s. Sound travels almost 5 times faster through water than in air Sound travels almost 20 times faster through iron than in air Lighting flash is seen first and thunder sound is heard next is due to the light travels million times faster than sound .
  10. Elephant=16-20000hz cow -16-40000hz Cat=lOO-32000hz Dog=40-46000hz Rabbit= 1000- hz Dolphin=70 -l s
  11. SONAR SONAR- SOUND NAVIGATION AND RANGING ultra sonic waves to measure Uses the under water object like submarine , water hills , ice bergs
  12. RADAR- RADIO DETECTION AND RANGING o The principle used here is doppler effect Radar is an object-detection system that uses radio waves to determine the range, velocity of objects, It can be used to detect aircraft, ships .
  13. DOPPLER EFFECT(CHRISTIAN JOHANN DOPPLER) "IAhe l)oppler EtTect Ibe change in wavelength of radiation (light} due the relative motion the source the observer ,ulong '1110 line or sight."

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