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After study in this units , student is will be able 2:
• Explain how sound is our produced by vibrating source and that of sound wave require a material medium for their propagations.
• Define the term and condition for pitch , loudness , quality of sound .
• Describe the change in amplitude is loudness and effects of change will frequency on pitch of sounds.
• explain that noise is a nuisance.
• describe audible frequency range.
describe the importance of acoustic protection.
Science, Technology and Society Connections
The students will be able to:
• Describes that some sounds is our Injurious to Health.
• describe how knowledge of the properties of sound waves is applied in the design of building with respect to acoustics.
SUMMARY
• Sound is produced by a vibrating body. It travels in the medium from one another in the form of compressional waves.
Loudness is a feature of sound by which a loud and a faint sound can be distinguish It dependsupon the amplitude, surface area and distance from the vibrating body
• Sound energy flowing per second through unit area held perpendicular to direction of sound waves is called the intensity of sound. bel is unit of the inter.
levelofsound, where 1 bel = 10 decibels
• Pitch of the sound is the characteristics of sound by which a shrill sound can distinguished from a grave one. It depends upon the frequency.
The characteristics of sound by which two sound waves of same loudness and are distinguished from each other is called the quality of sound.
Sound to with jarring on effect our ear is known as noise and the sound have pleasant effects in our ear is known as musical sound.
Noise pollution has become a major issue of concern in some big cities. Any form sound which disturbs the normal functioning of any natural ecosystem or some human.community is the cause of noise pollution.
Noise pollution can be reduced to acceptable level by replacing the rusty noise environment friendlymachinery and equipmetting sound Needless to mention here that students and teachers of ICB, IMCB, ICG, IMCG located in all Sectors of Islamabad like G-6, G-7, G-8, G-9, G-10, F-6, F-7, F-8, I-8 etc. and all other institutions of Islamabad Capital Territory (Rural and Urban) affiliated with Federal Directorate of Education, Islamabad can surely get benefit by reading / studying our notes & key books. However the students of Sindh, KPK, Balochistan and Azad Kashmir can also utilize these notes as per their course / books.
reducing barriers, or using hearing protection devices.
The technique or method used to absorb undesirable sound energy by soft and porous surfaces is called acoustic protectionThis can be done by using soft ,rough and porous miterials
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