Một dung dịch của 1 chất thuốc có nồng độ 0.001%, do độ hấp thụ của dung dịch này ở bước sóng 472 nm, dùng cuvet 1cm thu được mật độ quang A = 0,55. a/. Tính độ hấp thụ riêng E1%1cm của mẫu thuốc?

Although light from the sun appears white, it is actually made up of a lot of different colors. this portion of the electromagnetic spectrum, we call white light is referred to as within the electromagnetic spectrum.

What occurs during a combustion reaction

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.