Dhwani Ki Tivrata Kis Ikai Se Mapi Jati Hai ? ध्वनि की तीव्रता किस इकाई से मापी जाती है ?

ध्वनि की तीव्रता किस इकाई से मापी जाती है ?

Sharawan ola Ola on 14-02-2021

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