The heaviest elements will generally have a neutron-to-proton ratio about equal
ID: 989449 • Letter: T
Question
The heaviest elements will generally have a neutron-to-proton ratio about equal to________ 0.5. 1.0. 1.3. 1.5 0.8. A half-life is______ the life that a nuclear chemist leads. the time for one-half of the unstable nuclei to decay. independent of the rate constant for decay. half of the lifetime of an unstable nucleus. constantly changing. When a positron and an electron collide, they________ form a proton. strongly repel one another and recoil. annihilate each other and produce gamma rays. form a neutron and emit gamma rays form a neutron. Nuclear fission produces energy because_______ the total mass of the products is less than that of the reactants. the total mass of the products is more than that of the reactants. it is a very powerful chemical reaction. neutrons are produced. photons are produced. Uranium-235 is the fuel in nuclear power plants. When a nucleus of uranium-235 captures a neutron, the nucleus splits into two lighter nuclei and initiates a chain reaction. The chain reaction is driven by the emission of________ protons. positrons. neutrons. beta particles. alpha particles. Each of the next questions is graded over 10 points Answer 10 points only, show your work.Explanation / Answer
Answer
16) Option D 1.5 . if N/P ratio is less than 1 means it is a stable nucleus
17) Option B, Since Definition of Half-life,. the time required for one half the atoms of a given amount of a radioactive substance to disintegrate
18) Option C: Electron–positron annihilation occurs when anelectron (e) and a positron (e+, the electron's antiparticle) collide. The result of thecollision at low energies is the annihilation of the electron and positron, and the creation of gamma ray photons : e + e+ +
19) option A : In order for fission to produce energy, the total binding energy of the resulting elements must be less negative (higher energy) than that of the starting element.
20) option C: A neutron is absorbed by a uranium-235 nucleus, turning it briefly into an excited uranium-236 nucleus, with the excitation energy provided by the kinetic energy of the neutron plus the forces that bind the neutron.
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