Kaun Saa Upakarann Yantrik Urja Ko Dhwani Urja Me Parivartit Karta Hai ? कौन सा उपकरण यांत्रिक ऊर्जा को ध्वनि ऊर्जा में परिवर्तित करता है ?

कौन सा उपकरण यांत्रिक ऊर्जा को ध्वनि ऊर्जा में परिवर्तित करता है ?

ABHAY SINGH on 21-12-2015

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Sonu Singh on 21-12-2015

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