Nupur

Sound std VI


Sound is produced when the object perform a speedy to and fro motion or vibrations or oscillations
The loudness of weighed down depends upon premium of vibration.
The no. of times an object vibrates in one stake is called frequency
If the frequency is amply we say sound 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 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 sound 20 Hz is called Infra sonic Sound waves
The sound of 20,000 Hz called Ultrasonic sound waves.
Dogs atomic number 18 sensitive to infrasonic ie. 20 Hz mend bats are sensitive to ultrasonic
The term Super sonic is used to indicate the speed of an aeroplane traveling with focal ratio greater than speed of sound.
The speed of sound is 380 m/sec. in air & in water it is 1500 m/s.




We can give away to sound separately & 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 original and reflected sound if we are at distance of 11 mts or more from reflected surface.
Echo is simply a reflected sound. ( for acquiring echo we need more than 11 mts distance from us & reflecting surface)
The thoughtfulness of sound is used to measure the depth of the maritime level.
Sound is not reflected equally from different Materials.
Metallic sheets are good 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 want to get a full essay, order it on our website: Orderessay



If you want to get a full essay, wisit our page: write my essay .