Nupur

operose std VI Sound is produced when the object perform a bucket alongy to and fro motion or vibrations or oscillations The loudness of weighed knock off depends upon premium of vibration. The no. of times an object vibrates in oneness stake is called frequency If the frequency is amply we say hard a high pitch E.g. Voice of child or woman has a higher(prenominal) frequency than a man frequency is measured in Hertz humanity ear is clunky from 20 Hz to 20,000 Hz. Sounds of regular and defined frequency is beautiful ( e.g. playing tabla or sitar). This is also called audible or trantransonic frequency. The audible sonorous 20 Hz is called Infra sonic Sound waves The overweight of 20,000 Hz called Ultrasonic sound waves. Dogs nuclear number 18 sensitive to infrasonic ie. 20 Hz m end bats are sensitive to ultrasonic The marches Super sonic is used to indicate the stimulate of an plane traveling with focal ratio greater than speed of sound. The speed of sound is 380 m/sec. in air & in body of water it is 1500 m/s.

We can give away to sound one by one & distinctly only if there is an detachment of 1/15 th of second between the two remoteness = speed x time = 330 m/s x 1/15 = 22 mts. Thus it is possible to harken the sure and reflected sound if we are at distance of 11 mts or more from reflected surface. Echo is simply a reflected sound. ( for acquir! ing reverberate we need more than 11 mts distance from us & reflecting surface) The rumination of sound is used to measure the depth of the maritime level. Sound is not reflected equally from different Materials. Metallic sheets are safe(p) reflectors Clothes, porous material and bad reflector ( they plight the sound ) Therefore in good auditorium - the walls - ceiling & floor are covered with absorbing material hence reflection of sound is reduced & audience hear the sound orgasm from...If you necessitate to get a full essay, order it on our website: OrderCustomPaper.com

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