Bihar Board विज्ञान Class 9 Chapter 12 Vigyan Videos बिहार बोर्ड

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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