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Thursday, October 3, 2019
ध्वनि तरंगे किसके कारण प्रतिध्वनि उत्पन्न करते हैं ?
(A) विवर्तन
(B) परावर्तन
(C) अपवर्तन
(D) इनमें से कोई नहीं
Ans- B
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