29/03/2020 Radioactivity(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. When an alpha particle is ejected from a nucleus, the nucleus then has lessMass. .Neither of theseBoth of theseCharge2. 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.35.48121732.033. The half-life of carbon 14 is 5730 years. If a 1-gram sample of old carbon is 1/8 as radioactive as 1-gram of a current sample, then the age of the old sample is about17,200 years.716 years.22,900 years.11,500 years.4. A nucleon is either A neutron or an electronA positron or an electron.A proton or an electronA proton or a neutron5. The operation of a cloud chamber relies onMagnetization.Condensation.Acceleration.Evaporation.6. The end result of radioactive decay can be a different All of theseIsotope.Element.Atom.7. A sample of relatively active radioactive material is somewhat Cooler than the environment.Neither reallyWarmer than the environment.8. Different isotopes of an element have different numbers of Photons.HadronsProtons. .Neutrons.9. Electric forces within an atomic nucleus tend to Hold it together.Push it apart.Neither of these10. 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? 1.892.5625618.9511. Most of the radioactivity we personally encounter comes from Fallout from past and present testing of nuclear weapons.Nuclear power plants.The natural environmentMedical X rays.12. Which answer is closest to the half-life of the parent shown here?82 minutes5730 years1.5 years45 seconds13. There is a greater proportion of carbon 14 in Same in eachNew bones.Old bones.14. When thorium (A = 90) emits a beta particle, the resulting nucleus has atomic number88None of these899015. The half-life of a radioactive substance is INDEPENDENT of All of the aboveWhether the substance exists in an elementary state or in a compound.The temperature of the substance.The number (if large enough) of atoms in the substance.16. The very last symbol above represents: A beta particleAn alpha particleThe daughter nucleusA neutron17. When a beta particle is ejected from a nucleus, the nucleus then has a greaterMass.Charge.Neither of theseBoth of these18. In nuclear fusion, atoms of hydrogen are combined under intense heat and pressure to form ?CarbonNitrogenHeliumHydrogen19. It's impossible for a hydrogen atom to emit an alpha particle. FalseTrue20. X-rays may be regarded as Both of theseHigh frequency radio waves.High frequency sound waves.None of these21. 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.FalseTrue22. Over 99% of the mass of an atom is located within the tiny nucleus. FalseTrue23. When radium (A = 88) emits an alpha particle, the resulting nucleus has atomic number 9086928824. The most harmful radiations are those that Kill living cellsRestore living cellsDamage living cells25. How did the atomic number increase by one?A proton was captured by the carbonA neutron changed into a protonA beta particle was captured by the nitrogenAn electron was changed into a proton26 out of 25Time is Up!