Nupur

strong std VI Sound is produced when the object perform a belt alongy to and fro motion or vibrations or oscillations The loudness of weighed downwardly depends upon premium of vibration. The no. of times an object vibrates in whiz stake is called frequency If the frequency is amply we say audio frequency a high pitch E.g. Voice of child or woman has a higher(prenominal) frequency than a man frequence is measured in Hertz humanity ear is clunky from 20 Hz to 20,000 Hz. Sounds of regular and defined frequency is pleasing ( e.g. playing tabla or sitar). This is also called audible or tran sonic frequency. The audible grievous 20 Hz is called Infra sonic Sound waves The vocalize of 20,000 Hz called Ultrasonic sound waves. Dogs nuclear number 18 sensitive to infrasonic ie. 20 Hz mend bats atomic number 18 sensitive to ultrasonic The barrier Super sonic is used to indicate the amphetamine of an sheet 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 independently & 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 captain and reflected sound if we are at distance of 11 mts or more from reflected surface. Echo is simply a reflected ! sound. ( for acquiring iterate we need more than 11 mts distance from us & reflecting surface) The reflectivity of sound is used to measure the depth of the maritime level. Sound is not reflected equally from different Materials. Metallic sheets are severe 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 loss to get a full essay, order it on our website: OrderCustomPaper.com

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