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दो वस्तुओं के मध्य ध्वनि की प्रतिध्वनि सुनाई पड़ने हेतु अल्पतम दूरी क्या होनी चाहिए?

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दो वस्तुओं के मध्य ध्वनि की प्रतिध्वनि सुनाई पड़ने हेतु अल्पतम दूरी क्या होनी चाहिए?






 
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