Radioactive isotopes questions and answers A) Beta. Therefore, the correct answer is "Atoms of the same element with different numbers of neutrons. Atoms of the same element, which vary in neutron number, are called isotopes. Isotopes: The atoms of an element having the same atomic number but a different mass number are called isotopes. 3. Dec 19, 2023 · D. Lead increases the half-life of radioactive sources. Answer. Question 1 involves carbon-14 dating of wood samples and how nuclear weapons testing after 1950 affects accuracy. 3 hours? • Use the above information to answer the following questions a Questions Q1. 0 g remain at 2:00 PM, what is the half life of the isotope? In this problem, you must figure out how many half lives have occurred. 4) If 20. number of protons in the nucleus of an atom Question 4: What is the primary difference between a radioactive isotope and a stable isotope? (a) Radioactive isotopes have more neutrons. All radioactive isotopes decay completely and disappear within a short time (1 year or less) 30. (1) A It is half the time for all the atoms to decay B It is the time it takes for an atom to half decay Object is exposed to radiation but does not become radioactive. B Oct 4, 2024 · Isotope Quizzes, Questions & Answers Immerse yourself in the fascinating world of atomic science with our isotope quizzes. Among the things to consider are the isotope chosen, its half-life and decay energy, the power needs of the probe and the length of the flight. B. If 1. 53125 (this is the decimal amount that remains) (1/2) n = 0. (From Grant & Hackh's Chemical Dictionary, 5th ed & McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Dec 10, 2024 · The time it takes for the number of nuclei of a sample of radioactive isotopes to decrease by half In other words, the time it takes for the activity of a sample to fall to half its original level Different isotopes have different half-lives and half-lives can vary from a fraction of a second to billions of years in length A. Question 11 19. Based on argon’s reported atomic mass, which isotope exist as the most abundant in nature? Explain. Answer:- B. 2 Radioactivity for the Cambridge (CIE) O Level Physics syllabus, written by the Physics experts at Save My Exams. atom. 5g in 24. 0g of Cs-137 disintegrates over a period of 90 years, how many grams of Cs-137 would remain? Isotopes that exhibit radioactivity and undergo radioactive decay. Proton. How many half-lives will occur in 40 years? 3. This means that during the question, two half lives have Questions and model answers on 5. sum of the numbers of neutrons and protons in the nucleus of an atom. 53125 What is the half-life of a radioactive isotope if a 500. Knowledge application - use your knowledge to answer questions about the composition of radioactive isotopes Additional Learning. Radioactive Decay Problems Solutions 1. After one half life 20. (c) Radioactive isotopes undergo spontaneous nuclear decay. Hydrogen has three isotopes depending on the number of neutrons – 0, 1 or 2. The units of radioactive decay are Bq (becquerel). Unstable. Copper exists as a mixture of two isotopes. Argon has three naturally occurring isotopes: argon-36, argon-38, and argon-40. Isotopes of an element have a different number of. Which graph best shows how the activity of a radioactive isotope changes with time? Put a cross ( ) in the box next to your answer. C. Unreasonable Results It can be measured by finding the time it takes for the count rate due to that isotope to halve. However, the difference in the number of neutrons can affect the stability and radioactive properties of the isotopes. Question 2 is about a teacher Study with Quizlet and memorize flashcards containing terms like Radioactivity is due to:----, Radioactivity occurs when an atomic ----- breaks down into smaller particles. All radioactive isotopes have a specific half-life, or time that it takes for exactly half of the sample to This document contains 3 questions about radioactive dating and medical isotopes. One becquerel is defined as the activity (i. If a nuclear bomb released 8 kg of this d. Danger from radiation emitted within the object. How much of the isotope will you have left after 10 years? b. Neutron. e. Q1. , Write the symbol for alpha particle. 3, determine the numbers of protons, neutrons, and electrons in a neutral atom of the isotope. Problem #5: A radioactive isotope decayed to 17/32 of its original mass after 60 minutes. Construct a problem in which you calculate the mass of a radioactive isotope you need in order to supply power for a long space flight. It is produced in the upper atmosphere by cosmic rays and brought to Earth by rain. Caused by presence of radioactive sources outside the body. All isotopes have the same chemical properties. The half-life of plutonium-239 is 24,300 years. 33 yr. 0g. 92. Find the half-life of this radioisotope. (b) Radioactive isotopes have fewer protons. If you want to find out more about radioactive isotopes, review Decay - Nucleus - Isotope: 1: What is a Decay? Answer: 2: During Radioactive Decay, what can a Nucleus Emit? Answer: 3: Is Radioactive Decay a Random Process? Answer: 4: What are the Three Types of Radioactivity called? Answer: 5: What does the Nucleus of an Atom contain? Answer: 6: What is the Atomic Number? Answer: 7: What is the Mass Number radioactive decay. (d) Radioactive isotopes have different electron configurations. 2. 0 g of a radioactive isotope are present at 1:00 PM and 5. Caused by inhalation or ingestion of radioactive sources. 5 = log 0. ! argon has an atomic mass of 39. The half-life of a radioactive element is 24 hours. Answer: a Explanation: The isotopes have same number of protons but different number of neutrons in their nucleus. What is radioactivity? Radioactivity is a natural and spontaneous process. An isotope of caesium (Cs-137) has a half-life of 30 years. (Strontium-88 is the most abundant stable isotope for Sr. After a second half life, 10. How much of the isotope will you have left after 20 years? c. the rate of decay or the count rate) of a quantity of radioactive material in which one nucleus decays per second. Jan 10, 2021 · For each of the isotopes in Question 21. What type of decay emits an alpha particle? and more. It asks about particle identity, beta decay, plotting data, determining sample age from a graph, and how increased C-14 in the atmosphere impacts trees grown after 1950. Which of the following is not one of them. If you have 100 grams of a radioactive isotope with a half-life of 10 years: a. Question: How do tracers work in studying biological processes? Answer: Radioactive tracers are isotopes that emit radiation and can be tracked as they move through biological systems. For radioactive isotopes, the rate (speed) of radioactive decay is constant. 948 amu, which is closet to argon-40, suggesting that it is the most abundant isotope! 2. D. SrPredict the decay pathway for 90. Q21. Most often, in chemistry at least, you will be asked to determine the activity, quantity, the decay rate of radioactive isotopes, the time required to drop the activity to a certain level, or apply those to techniques such as carbon dating for calculating the age of ancient objects. Some elements have many stable isotopes (tin has 10) while others have only one or two. Lead decreases the half-life of radioactive sources. Calculate the fraction of the original element that would have disintegrated in 96 hours. 0g sample decays to 62. Three types of radioactive elements are emitted when unstable nuclei undergo radioactive decay. ) 1. 3The isotope of hydrogen, which is called tritium (because it contains three nucleons), has a half-life of 12. The final answer to the above question is 15/16 In these practice problems, we will work on the kinetics of radioactive reactions. ) (Strontium-90 is a particularly hazardous radioactive isotope because, as an alkali earth metal, it will substitute for calcium in bones and teeth. 53125 n log 0. 0g becomes 10. The atomic number is affected by all forms of radioactive decay. 4. By monitoring their movement, researchers can study processes such as metabolic pathways or blood flow. Designed to both challenge and educate, these quizzes will guide you through the incredible realm of isotopes—the variations of elements that build the fabric of our universe. Electron. Oct 4, 2024 · Since neutrons do not affect the chemical properties of an element, isotopes of the same element have the same chemical properties. Which of these is correct for half-life? Put a cross ( ) in the box next to your answer. Radiation can be in the form of particles (alpha, beta, or positron) and/or pure energy (gamma rays). Prevented by using shielding, such as lead clothing Terms; Ads and Cookie Settings; Quizlet for Schools; Parents; Language Apr 13, 2023 · Therefore, the fraction of radioactive material that has decayed is 7/8. " May 28, 2020 · Answer e (γ or \(\ce{^0_0γ}\)) short wavelength, high-energy electromagnetic radiation that exhibits wave-particle duality. It can be used to measure the age of objects up to about 100 yr. Problem 5 . (1) Q2. Lead absorbs emissions from the radioactive sources. A. 5 Write the nuclide notation, including charge if applicable, for atoms with the following characteristics: tritium, which is radioactive. Danger is from radiation emitted outside the object. Radioactive isotopes are called radioisotopes or radionuclides. Answer g. nucleus of a particular isotope. 0g becomes 5. Answer :- B. 2. Answer h. Half-Life Chemistry Questions with Solutions. Solution: 17/32 = 0. Lead repels emissions from the radioactive sources. Mar 20, 2025 · Atoms are radioactive if their nuclei are unstable and spontaneously (and random) emit various particles α, β, and/or γ radiations. Answer f. vfw zqax rvldja awub zcfla zlalmad ldmir bwpby wxqgv ykju gpurbl jubg yepkcq gfax ghxox