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SAI INTERNATIONAL SCHOOL
                                                          Class8
                                                     Lesson Notes
                                                   Subject-Physics
                                                       CH-Sound
                                                Subtopic-Introduction

               NOTES

               Definition of sound:
               Sound is a form of energy which gives sensation of hearing.


















               Sound is produced by vibrating body,
               examples: vibrating membrane, string, metal disc, tuning fork etc.

               Tuning fork is used to produce sound of fixed frequency in labs.















               Vibration:
               To and fro or back and forth motion of an object is called vibration.

               Speed of sound in air is approx. 330m/s.

               Speed of sound is less than speed of light.
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