29/03/2020 Radioactivity(Senior Class Physics Study by Topics) 29/03/2020 0Comments by Gate Academy Welcome to your Radioactivity(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. An element emits 1 alpha particle, 1 positron, and 3 beta particles. Its atomic number Stays the same. Decreases by 2. Decreases by 1. Increases by 1 2. Isotopes of the same element have different numbers of these particles. protons neutrons electrons 3. An element will decay to an element with higher atomic number in the periodic table if it emits A beta particle. A proton. A gamma ray. An alpha particle. 4. The very last symbol above represents: A neutron The daughter nucleus An alpha particle A beta particle 5. Suppose a chunk of compound XY equal to the mass of the samples used above was held at the same distance from the counter. The counter is run for one minute. What range of counts per minute would you expect to see? No counts 91 to 100 5 to 13 182 to 200 6. When a nucleus emits a beta particle, its atomic number Remains constant, and so does its mass number. Changes, but its mass number remains constant. Remains constant, but its mass number changes. Changes, and so does its mass number. 7. Which answer is closest to the half-life of the parent shown here? 1.5 years 5730 years 45 seconds 82 minutes 8. It's impossible for a hydrogen atom to emit an alpha particle. True False 9. Which body is heated in its interior by nuclear processes? The Earth Neither Both The sun 10. When a beta particle is ejected from a nucleus, the nucleus then has a greater Mass. Both of these Charge. Neither of these 11. A quark is A building block of nucleons A building block of hadrons. All of these An elementary particle. 12. Samples of three substances (I, II, and III) were left several days on a piece of photographic film wrapped in light-tight paper, as shown in figure (a). The appearance of the film after being developed is shown in figure (b). Based on this which of these substances seems to be the most radioactive? I, II, and III I only II only I and III only 13. The end result of radioactive decay can be a different Element. Atom. Isotope. All of these 14. Which of the following isotopes is radioactive? Carbon-14 Neither is radioactive in nature. Carbon-12 Both are radioactive. 15. Generally speaking, the larger a nucleus is, the greater its Stability. Neither stability nor instability Instability. 16. Once an alpha particle is outside the nucleus it is Free to wander about the nucleus. Quickly bound to a neighboring nucleus. Radioactive Electrostatically repelled. 17. At which location or locations was radioactive material floating in the air? Location X Location Z Location Y Location Y and Z 18. There is a greater proportion of carbon 14 in New bones. Same in each Old bones. 19. The sources of X-rays and gamma rays, respectively, are Both electron clouds. The atomic nucleus and electron clouds. Both the atomic nucleus Electron clouds and the atomic nucleus. 20. When a gamma ray is emitted by a nucleus, the nucleus then has less Charge. Energy. Both of these Neither of these 21. The small white circles represent: Protons Electrons Alpha particles Neutrons 22. The number of these particles determines the atomic number Protons Neutrons Protons and electrons Protons and neutrons 23. When a nucleus emits a beta particle, its atomic number Decreases by 2 Increases by 2 Increases by 1. Decreases by 1. 24. The half-life of an isotope is one day. At the end of two days the amount that remains is One-half. None. One-quarter. One-eighth. 25. This subatomic particle has a negative charge. photon electron neutron proton 1 out of 25 Time is Up! Time's up