Created by StemPy LabA radioactive sample starts with equal numbers of nuclei of two isotopes, A and B. Isotope A has a half-life of and isotope B has a half-life of . Neither isotope decays into the other. After , the ratio of the activity of A to the activity of B is
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← Unpolarised light of intensity I₀ passes through three ideal polarising sheets placed one after another. The transmission axis of the third sheet is perpendicular to that of the first sheet. The axis of the middle sheet makes an angle of 30° with the axis of the first sheet. The intensity of the light coming out of the third sheet isIn the circuit shown in the figure, an ideal 12 V battery is connected through a 2 Ω resistor to two branches in parallel. One branch has an ideal diode D₁ in series with a 4 Ω resistor, and the other branch has an ideal diode D₂ in series with a 2 Ω resistor. The two diodes face opposite ways, as shown. The current drawn from the battery is →
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