Sound by Pratiksha Yadav

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Sound by Pratiksha Yadav

  1. 1. {SOUND} MADE BY : PRATIKSHA YADAV Class : 9th
  2. 2. Contents • Introduction • propagation of sound • wave • types of wave • characteristics of sound wave • frequency • amplitude • speed • Reflection of sound • reverberation • Range of hearing • SONAR • Human ear
  3. 3. introduction Sound is a form of energy which produces a sensation of hearing in our ears.
  4. 4. Propagation of sound  Sound is transmitted by particles (atoms or molecules) in a solid, liquid or gas colliding with each other. It is a wave which is created by vibrating objects and propagated through a medium (solid, liquid or gas) from one location to another.
  5. 5. Wave The disturbance created in a medium ( solid , liquid , gas ) .
  6. 6. Types of wave Longitudinal waves – the wave in which the particles of medium vibrates to and fro in the same direction in which wave is moving. Transverse wave – the wave in which the particles of medium vibrates up and down to the direction in which the wave is moving .
  7. 7. Frequency Amplitude speed
  8. 8. Frequency • The frequency is the number of wave created Per second is called frequency .
  9. 9. Amplitude Amplitude is the magnitude of change in the oscillating variable with each oscillation within an oscillating system.
  10. 10. Speed The speed of sound depends on the medium the waves pass through .
  11. 11. State state solids liquids Gases substance Iron steel Water (sea) Water (distilled) air oxygen Speed in m/s 5950 5960 1531 1498 346 316
  12. 12. Reflection of sound • Multiple reflection of sound is the process in which sound waves bounces off obstacles and reflects many times before reaching the destination. this is the phenomena that occurs in a stethoscope. sound waves reflect through the tube many times before reaching the ears of the doctor. It is very helpful in detecting problems.
  13. 13. Reverberation • Reverberation is the persistence of sound in a particular space after the original sound is removed. A reverberation, or reverb, is created when a sound is produced in an enclosed space causing a large number of echoes to build up and then slowly decay as the sound is absorbed by the walls and air.
  14. 14. Range of hearing • Hearing range usually describes the range of frequencies that can be heard by an animal or human, though it can also refer to the range of levels. In humans the audible range of frequencies is usually said to be 20 Hz (cycles per second) to 20 kHz (20,000 Hz) .
  15. 15. SONAR Sonar stands for sound navigation and ranging . Sonar is a device that uses ultrasonic waves to measure the distance , direction and speed underwater objects .
  16. 16. Human ear The ear is the anatomical organ that detects sound. It not only acts as a receiver for sound, but also plays a major role in the sense of balance and body position. The ear is part of the auditory system.
  17. 17. [MCQs]
  18. 18. A sound wave travels from east to west, in which direction do the particles of air move? (A) East – west (B) North - south (C) Up and down (D) None
  19. 19. . In which medium sound travels faster ? (A) Solid (C) Gas (B) Liquid (D) None
  20. 20. What is the name of short duration wave? (A) Pulse (C) Time period (B) Frequency (D) Velocity
  21. 21. What is the velocity of sound in water at room temperature? (A)1500 m/s (B) (B) 330 m/s (C) 1500 km/s (D) 330 km/s
  22. 22. The unit of quantity on which pitch of the sound depends is : (A)Hertz (B) meter (C) meter/second (D) second
  23. 23. The unit of quantity on which loudness of found depends is : (A) meter (B) Hertz (C) meter/second (D) second
  24. 24. Nature of sound wave is : (A) transverse (B) longitudinal (C) electromagnetic (D) seism
  25. 25. Pitch of high frequency sound is : (A) high (C) zero (B) low (D) infinite
  26. 26. Voice of a friend is recognized by its : (A) Pitch (C) Intensity (B) quality (D) velocity
  27. 27. Sound waves in air are : (A)Longitudinal waves (B) Radio waves (C) Transverse waves (D) Electromagnetic waves
  28. 28. 1-A 3-A 5-A 7-B 9-B 2-A 4-A 6-A 8-A 10-A

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