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The illustration shows how a radioactive sample is decaying over time. What is its half-life and decay constant?
2 days, 4 x 10^-6
What is the half-life of a sample where the activity drops from 1,200 Bq down to 300 Bq in 10 days?
Half of 1,200 is 600, half of 600 is 300. So it takes two half-lives to drop from 1,200 Bq to 300 Bq, which is 10 days. So one half-life is five days.
what elements are used as nuclear fuel?
The main nuclear fuels are uranium and plutonium. In a nuclear power station, the energy released is used to produce electricity
What has the same mass number but different nuclear charge?
Isobars are atoms (nuclides) of different chemical elements that have the same number of nucleons.
What has the same nuclear charge but different mass number?
Isotopes
A radioactive source has a half-life of 80 s. How long will it take for 7/8 of the source to decay?
240 s
What is mass defect in simple words? mass defect formula-?
mass between an atom and the sum of the masses of the protons, neutrons, and electrons of the atom.
What is the binding energy of an atom? nuclear binding energy formula-?
The energy required to disassemble an atom into free electrons and a nucleus.
What is the process shown in this animation?
Electron–positron annihilation occurs when ( e− ) and ( e+) collide and creat an energetic photons
What is the quark conversion process that lies at the heart of beta-minus decay? you can draw diagram.
in beta minus decay a down quark changes into a up quark with the emission of an electron and an anti-neutrino.
What is the quark conversion process that lies at the heart of beta-plus decay? you can draw diagram.
In beta plus decay an up quark changes into down quark with the emission of a positron and a neutrino,
What is the beta plus decay?
in which a proton inside a radionuclide nucleus is converted into a neutron while releasing a positron and an electron neutrino
What is the alpha decay?
when nucleus emits an alpha particle and transforms into a different atomic nucleus
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