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in Physics by (74.2k points)
বেগ স্থির রেখে কোনো একটি মাধ্যমের মধ্যে সঞ্চালিত শব্দের তরঙ্গদৈর্ঘ‍্য 50% হ্রাস পেলে, কম্পাঙ্কের শতকরা পরিবর্তন হবে
A. 0.5
B. 0.25
C. 1
D. 2

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