Asolid copper sphere whose raclius is 10 em has a very thin surface contin of nickel some of the nickel atoms are radioactive and emit an electron with each decay. due to the geometry of the situation, half of these electrons enter the copper sphere, each depositing 100 kev of energy there. the other half of the electrons escape, each carrying away a charge of c. the nickel coating has an activity of 10 mci (millicuries) -3.70 x 10 radioactive decays per second. the sphere is hung from a long, nonconducting string and isolated from its surroundings. (a) how long will it take for the potential of the sphere to increase lw 1000 v7 note: 1 ev = 1.602 x 1019 joules (b) how long will it take for the temperature of the sphere to increase by 5.0° c due to the energy deposited by the electrons? the heat capacity of the sphere is 14.3 j/k.

Classify the following soils according to the uscs classification system. provide appropriate uscs designations. a) this sample of well-graded gravel with sand was obtained from a large earthen dam in vancouver, canada. the sample has 73% fine to coarse sub-angular gravel, 25% fine to coarse sub-angular sand and 2% fines. the maximum size of the particles is 75 mm. the coefficient of curvature is 2.7, while the uniformity coefficient is 12.4. b) this dark brown and wet soil with a “strong organic odor” has 100% passing the no. 200 sieve. the liquid limit of the material is 32% when not dried and is 21% when oven-dried. the plastic index is 21% when not dried. c) this sand has 61% predominantly fine sand, 23% silty fines, and 16% fine sub-rounded gravel size. the maximum size is 20 mm. the liquid limit is 33% and the plastic limit is 27%. d) this soil has 74% fine to coarse sub-angular reddish sand and 26% organic and silty dark brown fines. the liquid limit is 37% when not dried and is 26% when oven dried. the plastic index is 6% when not dried.

Describe the function of the endomembrane system? what organelles are involved?

State the below theories and give the name of the writer of the theory 1. wave theory 2. quantum theory 3. corpuscular theory 4. electromagnetic theory