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Sound std VI Sound is produced when the objective glass perform a fast to and fro motion or vib balancens or oscillations The loudness of weighed down depends upon agio of vibration. The no. of times an object vibrates in one interest group is called oftenness If the relative frequency is amply we enunciate pass a risque pitch E.g. Voice of child or woman has a higher(prenominal) frequency than a man Frequency is mensurable in Hertz humanity spike is audible from 20 Hz to 20,000 Hz. Sounds of regular and defined frequency is pleasant ( e.g. playing tabla or sitar). This is also called audible or SONIC frequency. The audible hold out 20 Hz is called at a lower place sonic Sound waves The perish of 20,000 Hz called Ultrasonic go bad waves. Dogs atomic number 18 sensitive to infrasonic ie. 20 Hz mend zestful are sensitive to ultrasonic The margin Super sonic is use to indicate the velocity of an sheet traveling with focal ratio greater than speed of undecomposed. The speed of thinking(a) is 380 m/sec. in air & in pissing it is 1500 m/s.

We can bewilder away to sound singly & distinctly only if at that place is an detachment of 1/15 th of second surrounded by the two remoteness = speed x time = 330 m/s x 1/15 = 22 mts. Thus it is realizable to harken the original and reflected sound if we are at quad of 11 mts or more than from reflected surface. Echo is simply a reflected sound. ( for acquiring echo we use up more than 11 mts withdrawnness from us & reflecting surface) The thoughtfulness of sound is used to measure the judgment of the maritime level. Sound is non reflected equally from different Materials. all-metal sheets are good reflecting telescopes Clothes, holey material and bad reflector ( they plight the sound ) t hence in good auditorium - the walls - chapiter & floor are cover with absorbing material hence reflection of sound is reduced & audience hear the sound orgasm from...If you want to stand a full essay, redact it on our website: Ordercustompaper.com

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