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30-12-2023
Physics

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یک فرد تقریباً 20 میلی گرم ذرات دود تنباکو را از یک سیگار استنشاق می کند. اگر ذرات دود کره هایی با چگالی 1000 گرم بر متر مکعب با قطر 0.4 میکرومتر باشند،مساحت سطح این مقدار دود چقدر است؟

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