29/03/2020Radioactivity(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Radioactivity(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. The atomic number of an element is the same as the number of itsNucleons.Neither of theseProtons.Neutrons.2. All deposits of natural uranium contain appreciable amounts ofLead.Iron.Gold.All of these3. The number 14 is the:Atomic numberMass numberAverage atomic mass4. X-rays are similar toAlpha rays.All of theseGamma rays.Beta rays.5. 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.FalseTrue6. It's impossible for a hydrogen atom to emit an alpha particle.TrueFalse7. The half-life of Radium-229 is 4 minutes. What was the original mass (to the nearest 1/100th of a gram) of Ra-229 if .32 g remains after 12 minutes?25618.951.892.568. How did the atomic number increase by one?A proton was captured by the carbonA beta particle was captured by the nitrogenA neutron changed into a protonAn electron was changed into a proton9. A quark isAll of theseA building block of nucleonsAn elementary particle.A building block of hadrons.10. During a background measurement, a Geiger counter counted 1440 counts in 60 minutes. What was the background radiation? 2.4 counts/min6.5 counts/min65 counts/min24 counts/min11. This particle has a mass that is about 1800 times smaller than the other two.ProtonElectronNeutron12. The source of the Earth's natural heat isSolar energy in the form of fossil fuels.Molten-hot lava.Pressure on the Earth's interior.Radioactive decay in the Earth's core.13. The total number of these determines the mass number.Protons and electronsNeutrons and protonsNeutrons and electrons14. Once an alpha particle is outside the nucleus it isRadioactiveQuickly bound to a neighboring nucleus.Free to wander about the nucleus.Electrostatically repelled.15. Deuterium and tritium are bothNeither of theseBoth of theseForms of hydrogen.Isotopes of the same element.16. Isotopes of the same element have different numbers of these particles.neutronselectronsprotons17. At which location or locations was radioactive material floating in the air?Location Y and ZLocation ZLocation YLocation X18. Chlorine has two naturally occurring isotopes, Cl-35 with a relative abundance of 75.77% and Cl-37 with a relative abundance of 24.23%. Work out the average atomic mass of chlorine rounded to the nearest 1/100th of an amu.35.481232.031719. Radium-226 has a half-life of 1600 years. What percentage would be left (to the nearest 1/100th of a percent) after 6400 years?2.19%52.5%21.9%6.25%20. When a nucleus emits a beta particle, its atomic numberRemains constant, but its mass number changes.Changes, but its mass number remains constant.Remains constant, and so does its mass number.Changes, and so does its mass number.21. The atomic mass number of an element is the same as the number of itsProtons.Neutrons.None of theseNucleons.22. A gram of radioactive material has a half-life of one year. After 4 years, how much radioactive material will be left?1/4 g0 gNone of these1/2 g23. If an alpha particle and a beta particle have the same energy, which particle will penetrate farther into an object?Beta particleAlpha particleThey both penetrate the same distance.24. Radioactivity in the world is somethingAs old as the world itself.Relatively new.25. 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 onlyI and III onlyI, II, and IIIII only26 out of 25Time is Up!
