What is characteristic of alpha decay? (a) A neutron decays into a proton and an
ID: 3278419 • Letter: W
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What is characteristic of alpha decay? (a) A neutron decays into a proton and an electron: the electron is ejected. (b) A nucleus converts its energy of spinning into a high-energy photon (light particle). (c) A proton and an electron combine to form a neutron. (d) An unstable nucleus releases two protons and two neutrons that are bound together. According to the class lecture, why is radiotherapy, which can cause cancer treat cancer? (a) Radiation damages DNA, and so preferentially targets cells that multiply quickly, like cancer. (b) Unlike chemotherapy, which affects the whole body, radiotherapy can be used to treat only a specific area of the body. (c) The risk of cancer caused by radiotherapy is very small. (d) All of the above reasons are reasons why radiotherapy is used to treat cancer.Explanation / Answer
3. option D
A heavy atomic nucleus emits alpha particles( He 2+) i.e. two neutrons and protons bonded together. This happens because as the size of the nucleus increases the nucleus force just barely is able to keep the neutrons together where as electromagnetic force tries to disintegrate it. Alpha decay occurs in such nuclei as a means of increasing stability by reducing size. And to maintain the wave function symmetry this emission always happens in pair. Thus single proton or neutron emission is not preferable.
4. option d
Radiation works by making small breaks in the DNA inside cells. These breaks keep cancer cells from growing and dividing and cause them to die. Unlike chemotherapy, which usually exposes the whole body to cancer-fighting drugs, radiation therapy is usually a local treatment. In most cases, it’s aimed at and affects only the part of the body being treated. Radiation treatment is planned to damage cancer cells, with as little harm as possible to nearby healthy cells. Radiation therapy can slightly raise the risk of getting another cancer. The risk of a second cancer from these treatments is small and is outweighed by the benefit of treating the cancer, but the risk is not zero
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