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ছবি :সংগৃহীত রেলের সূত্র অনুসারে বিক্ষেপণের মাত্রা তরঙ্গ দৈর্ঘ্যের চতুর্থ ঘাতের ব্যস্তানুপাতিক । বিক্ষেপণ সৃষ্টিকারী কণার আকার আলোর তরঙ্গ দ...

এখন বাংলা ২৬ জানু, ২০২৩

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