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Thursday, October 3, 2019
जब ध्वनि तरंग चलती है तो वे अपने साथ क्या ले जाती हैं ?
(A) द्रव्यमान
(B) ऊर्जा
(C) ध्वनि
(D) इनमें से कोई नहीं
Ans- B
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