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General Knowledge Questions and Answers - 1301

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Question:
What are the characteristics of a sound ? Discuss each one of them briefly.
Answer:
Refer from Art.6.14.to Art.6.19, Pages 342 to 345.


More Questions :
  • What is acoustical transite ?
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  • What is the minimum distance of the obstacle from the source of sound for hearing distinct echo ?
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  • What is the range of frequencies of audio waves,infrasonics and ultrasonics ?
  • What are the characteristics of a sound ? Discuss each one of them briefly.
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  • Hearing may be damaged by excessive noise.So our ears sometimes need protection from continuous loud sound. Hearing damage depends on the sound intensity level (decibel level)and the exposure time,and the exact combinations vary for different people.Normally,at 90 dB,it takes 8 hours or less for the damage to receptor nerves to occur.Further,it is found that if the sound level is increased by 5 dB,the safe exposure limit is cut to half.
    (a) How long will it take for a sound of a very loud lawn mower (or a motorcycle) of 95dB to damage the hearing ?
    (b) What is the nonstop exposure time for a 105 dB sound to damage the ear ?
    (c) What should be done to protect the society from the danger of losing the divine gift of hearing power ?
  • Sounds we hear inform us of the state of world around us,especially of that part of it which our other senses,such as touch and sight,cannot reach.Illustrate this with appropriate examples.
  • A person standing between two vertical cliffs and 680 m away from the nearest cliff,shouted.He heard the first echo after 4 s and the second echo 3 s later.Calculate (a) the speed of sound in air and (b) distance between the two cliffs.
  • A man standing at 51 m from a wall fires a gun.Calculate the time after which an echo is heard.The speed of sound is 340 m/s.
  • sonar emits pulses on the surface of water which are detected after reflection from its bottom at a depth 1531 m.If the time interval between the emission and detection of the pulse is 2 s,find the speed of : sound in water.
  • What are wavelength,frequency,time period and amplitude of a sound wave ?
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