Created by StemPy LabThe activity of a radioactive sample is measured as counts per minute. Exactly one hour later, it is counts per minute. The half-life of the sample, in minutes, is ____.
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← A coil of 100 turns, each of area 0.01 m², has a total resistance of 2 Ω, and its ends are joined to make a closed circuit. A uniform magnetic field of 0.5 T passes through the coil, perpendicular to its plane. The field is switched off and falls to zero. The total charge that flows round the coil, in millicoulombs, is ____.A small drop of liquid, held together by surface tension, can wobble about its round shape. Suppose the frequency f of this wobble depends only on the surface tension σ of the liquid, its density ρ and the radius r of the drop, so that f = k σᵃρᵇ rᶜ with k a dimensionless number. Dimensional analysis gives →
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