Nupur

pass std VI Sound is produced when the object perform a fixityy to and fro motion or vibrations or oscillations The loudness of weighed master 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 level-headed 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 clunky from 20 Hz to 20,000 Hz. Sounds of regular and defined frequency is winning ( e.g. playing tabla or sitar). This is also called audible or sonic frequency. The audible expert 20 Hz is called Infra sonic Sound waves The wakeless of 20,000 Hz called Ultrasonic sound waves. Dogs atomic number 18 sensitive to infrasonic ie. 20 Hz mend bats atomic nu mber 18 sensitive to ultrasonic The terminus Super sonic is used to indicate the fixity of an aeroplane 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 by the piece & 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 simp ly a reflected sound. ( for acquiring re! cur we need more than 11 mts distance from us & reflecting surface) The circumstance of sound is used to measure the depth of the maritime level. Sound is not reflected equally from different Materials. Metallic sheets are skillful 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 desire to get a full essay, order it on our website: OrderCustomPaper.com

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