The average energy released in the fission of a single uranium-235 nucleus is about         3 x 10-11 J.  If the conversion of this energy to electricity in a nuclear power plant is 40% efficient, what mass of uranium-235 undergoes fission in a year in a plant that produces 1000. MW (megawatt)?  [hint: 1 watt = 1J/sec]

Question 52 of 55 How many pounds of Uranium are required per day to generate the electric energy of a 1000 mega Watt power plant? The fission of Uranium-235 produces 8.34 X 10¹⁰ J per gram. Only 4.0% of the total Uranium is Uranium-235. Only 33% of energy released from fission goes into making electrical energy. Report to two significant figures. 1 4 7 +/- 2 5 8 6 O Submit X x 100

When an electron and its anti-particle, a positron, collide, they annihilate each other. Calculate the energy released in this process, in J. (The positron mass is the same as the electron mass, namely 9.11 ×1031 kg.)

Macmillan l 30: F2 W S A 210.2 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 47 days the amount of radioactive substance had decreased to 26.28 ng. How many half-lives of the unknown radioactive substance have occurred? number of half-lives: #3 H 80 F3 mmand E D A GA $ X C 4 OOD 886 F4 R F % от ото 5 V F5 T G ^ 6 B F6 Y & 7 H 8 F7 U N 00 * 8 DII FB J L - ( 9 M K DD F9 O . V - ... I 4 F11 { [ option + = ? 11 1 F12 } ] half-lives delete return st