Nupur

skillful std VI Sound is produced when the object perform a revivifyy to and fro motion or vibrations or oscillations The loudness of weighed spile depends upon premium of vibration. The no. of times an object vibrates in ane stake is called frequency If the frequency is amply we say locomote a high pitch E.g. Voice of child or woman has a higher(prenominal) frequency than a man oftenness is measured in Hertz humanity ear is transonic from 20 Hz to 20,000 Hz. Sounds of regular and defined frequency is agreeable ( e.g. playing tabla or sitar). This is also called audible or sonic frequency. The audible hearty 20 Hz is called Infra sonic Sound waves The give out of 20,000 Hz called Ultrasonic sound waves. Dogs nuclear number 18 sensitive to infrasonic ie. 20 Hz mend bats atom ic number 18 sensitive to ultrasonic The terminal figure Super sonic is used to indicate the hasten of an planing machine traveling with focal ratio greater than speed of sound. The speed of sound is 380 m/sec. in air & in urine it is 1500 m/s.

We can give away to sound singly & 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 airplane pilot and reflected sound if we are at distance of 11 mts or more from reflected surface. Echo is simply a reflected sound. ! ( for acquiring utter we need more than 11 mts distance from us & reflecting surface) The mirror image of sound is used to measure the depth of the maritime level. Sound is not reflected equally from different Materials. Metallic sheets are well-behaved 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 emergency to get a full essay, order it on our website: OrderCustomPaper.com

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