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একটি ধাতব দন্ডের উপাদানের ইয়ং গুণাঙ্ক `2×10^(11)N*m^-2` এবং ঘনত্ব `8000 kg*m^-3`। ওই দন্ডটির মধ্য দিয়ে 1m অতিক্রম করতে শব্দ কত সময় নেবে?

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একটি ধাতব দন্ডের উপাদানের ইয়ং গুণাঙ্ক `2×10^(11)N*m^-2` এবং ঘনত্ব `8000 kg*m^-3`। ওই দন্ডটির মধ্য দিয়ে 1m অতিক্রম করতে শব্দ কত সময় নেবে?
A. `10^-4 s`
B. `2×10^-4 s`
C. `10^-2 s`
D. `2×10^-2 s`
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Correct Answer - B
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