Sound Grade8 Lesson 1

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  Sound  What is sound? ã sound is a vibration that can be heard. ã Object that produce sound are called sources of sound. ã It propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid. ã we can say sound is a wave What is wave? (rhythmic disturbance) ã A periodic disturbance created in medium that transfer energy is called wave.  ã Waves transfers energy and not the matter
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