119 50 69 19 2. In the analysis of a nuclear reaction, scientists identify the r
ID: 249546 • Letter: 1
Question
119 50 69 19
2. In the analysis of a nuclear reaction, scientists identify the rest masses of all reactants and products. By applying the equation E = mc2, what property of the reaction can be calculated?
-the speed of the reaction -the reaction energy -the kinetic energy of each component -the half-life of each component
3. A nuclear reaction has a reaction energy Q = -14.07 MeV. Which conclusion about the masses of the reaction components can be reached? Let 931.5 MeV = 1 u.
-one of the particles that enters into the reaction has a mass of 0.01510 u -the reaction involves a mass defect of 0.01510 u -one of the particles that is produced by the reaction has a mass of 0.01510 u -the reaction involves a mass increase of 0.01510 u
4. Uranium-235 undergoes a fission reaction as described by the equation below. The reaction energy Q= 178.9 MeV. What is the atomic mass of uranium-235? Let 931.5 MeV = 1 u.
-235.04397 u -235.3276 u -234.8519 u -234.6599 u
Explanation / Answer
1) N=protons+neutrons
N=50+69=119
2)
Using Einstein's mass-energy equivalence formula E = mc², the amount of energy released can be determined. Reaction energy
3)
Since Q = -14.07 MeV = -14.07/931.5 = - 0.01510 u
Hence this reaction involves a mass defect of - 0.01510 u
Your post includes too many subquestions, please make a new for the question 4.
Hint: The reaction is an example of induced fission. Because an energatic neutron is required for this reaction to complete it.
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