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एक ध्वनि तरंग का तरंगदैध्र्य क्या है जिसकी दिए गए माध्यम में आवृत्ति 820 हट्‌र्ज एवं चाल 420 मीटर/सेकंड है?

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एक ध्वनि तरंग का तरंगदैध्र्य क्या है जिसकी दिए गए माध्यम में आवृत्ति 820 हट्‌र्ज एवं चाल 420 मीटर/सेकंड है?






 
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