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?

If you want to change the pitch of a sound, you have to change the

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?