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Q.335 :  प्रतिध्वनी का कारण है?

(a) ध्वनि का परावर्तन
(b) ध्वनि का अपवर्तन
(c) ध्वनि का अवशोषण
(d) ध्वनि की चाल
View Answer
Answer :ध्वनि का परावर्तन

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