Class vi students visited science park in school premises and had hands on activity on propagation of sound through air with Parabolic Dishes in the park.Two students stood in front of the dishes with their mouth at the ring provided in front of the dishes.One child spoke in feeble voice and the other heard it clearly.
Sound waves from one person are reflected at the first dish travel in straight line to the second dish and converge into a single point and we hear a clear voice.
They also learn sound has property of reflection , convergence and divergence like light.
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