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. Which of the following materials are able to block some form of radiation? Skin All of he above Lead foil Clothing 2. Different isotopes of an element have different numbers of Neutrons. Photons. Hadrons Protons. . 3. When a gamma ray is emitted by a nucleus, the nucleus then has appreciably less Mass. Both of these Charge. Neither of these 4. During a background measurement, a Geiger counter counted 1440 counts in 60 minutes. What was the background radiation? 6.5 counts/min 2.4 counts/min 24 counts/min 65 counts/min 5. The helium nucleus here would be called: The daughter nucleus An alpha particle The parent nucleus 6. The high temperature of the Earth's interior is due mostly to Friction, as plates move past one another. Great internal pressure. Radioactivity The Earth's natural heat. 7. When a gamma ray is emitted by a nucleus, the nucleus then has less Both of these Charge. Energy. Neither of these 8. When an element undergoes nuclear transmutation, the result is a completely different Ion of the same element. Element Isotope of the same element. 9. In order for an atom to decay to an element which is one greater in atomic number, it can emit One positron and 2 beta particles. One beta particle. All of these One alpha particle and 3 beta particles. 10. The number 14 is the: Atomic number Average atomic mass Mass number 11. Deuterium and tritium are both Both of these Isotopes of the same element. Forms of hydrogen. Neither of these 12. A gram of radioactive material has a half-life of one year. After 4 years, how much radioactive material will be left? 1/2 g 1/4 g 0 g None of these 13. Found in the nucleus Electrons and neutrons Electrons and protons Protons, electrons and neutrons Protons and neutrons 14. An element will decay to an element with higher atomic number in the periodic table if it emits A gamma ray. A beta particle. An alpha particle. A proton. 15. The atomic number of an element is found by averaging the mass numbers of the isotopes and also takes into consideration the relative abundance of each isotope. False True 16. Radium-211 has a half-life of 13 seconds. If you started with 600 mg of Ra-211, how many seconds would it take until you only had 18.75 mg? 65 121 17.03 24.5 17. 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? 182 to 200 No counts 91 to 100 5 to 13 18. Electric forces within an atomic nucleus tend to Hold it together. Neither of these Push it apart. 19. Generally speaking, the larger a nucleus is, the greater its Stability. Instability. Neither stability nor instability 20. Isotopes of the same element have the same mass number but different atomic numbers. True False 21. Once an alpha particle is outside the nucleus it is Free to wander about the nucleus. Radioactive Quickly bound to a neighboring nucleus. Electrostatically repelled. 22. What conclusion can be reached based on the data from location Z? The filter has a net count of 29, and thus is radioactive. The filter has a net count of basically zero which means there was no radioactive material floating in the air. The filter has a negative net count which means the air removed radiation from it. The Geiger counter needs a new battery. 23. A nucleon is either A proton or a neutron A neutron or an electron A positron or an electron. A proton or an electron 24. When a nucleus emits a beta particle, its atomic number Increases by 1. Decreases by 2 Decreases by 1. Increases by 2 25. The number of these particles determines the atomic number Protons Protons and electrons Protons and neutrons Neutrons 1 out of 25 Time is Up! Time's up