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SAI INTERNATIONAL SCHOOL
                                                          Class8
                                                     Lesson Notes
                                                   Subject-Physics
                                                       CH-Sound
                                            Subtopic- Music and Noise



               Definition noise:
               Sound which is unpleasant to hear is termed as noise.


               Noise Pollution:
               Presence of unwanted sound in atmosphere is known as noise pollution.


               Differences between noise and musical sound.
               Noise :
               1. Unpleasant to hear.
               2. Have irregular wave forms.
               3. Sound from traffic.
               Music:
               1. Pleasant to hear.
               2. Have regular wave forms.
               3. Sound from musical instrument.

               Causes of noise Pollution
                Use of loud speaker
                Bursting crackers
                Traffic
                Industries and factories


               Steps to be taken to reduce noise pollution.
                       a. Plant more trees.
                       b. Noise absorbing material to be installed near the roads.
                       c. Factories and industries should be located away from residential area.
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