General Science Spashta Pratidhwani Sunne Ke Liye Paravartak Tal Wa Dhwani Source Ke Beech Minimum Doori Honi Chahiye ?

Q.10480: स्पष्ट प्रतिध्वनि सुनने के लिए परावर्तक तल व ध्वनि स्त्रोत के बीच न्यूनतम दूरी होनी चाहिए ?
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स्पष्ट प्रतिध्वनि सुनने के लिए परावर्तक तल व ध्वनि स्त्रोत के बीच न्यूनतम दूरी होनी चाहिए ? - To hear a clear echo, should there be a minimum distance between the reflective floor and the sound source? - Spashta Pratidhwani Sunne Ke Liye Paravartak Tal Wa Dhwani Source Ke Beech Minimum Doori Honi Chahiye ? General Science in hindi,   30 Meeter question answers in hindi pdf  40 Meeter questions in hindi, Know About 20 Meeter General Science online test General Science notes in hindi quiz book    17 Meeter

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