ध्वनि का उत्पादन, Chapter 12, ध्वनि, Vigyan, Class 9, Hindi Medium
विभिन्न माध्यमों ध्वनि की चाल, Chapter 12, ध्वनि, Vigyan, Class 9, Hindi Medium
सोनार, Chapter 12, ध्वनि, Vigyan, Class 9, Hindi Medium
https://www.youtube.com/watch?v=_fqt5NlEie4
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