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• Title : What Is Radioactive Decay? + Example half life of radioactive isotopes worksheet answers in Common Worksheets category

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a 50.0g sample of n-16 decays to 12.5 g in 14.4 seconds. what is the half-life? answer: 7.2 s i've done similar problems to these before (finding the reamining of the sample, the original sample) but i can't do the one when you have to find the half-life. i've substituted numbers into the formulas i learned from my book (i never got taught this - teacher was absent) and my answer was different then the worksheet's. however, i checked mine and i thought it checked out to be right but the worksheet's answer is right (too?) when you check it. my answer was 28.8 s please be detailed in showing the work so i can understand it. thanks!radioactive decay worksheet help?
i need help with my biology homework. can someone do these problems and explain how you got them? thanks =] **and please don't answer if you're going to tell me to do my own homework. i need the answers to learn how to figure it out. 1.) a paleontologist discovered fossil remains of ancestral mammal, and in order to have basis of comparison to other ancestral mammals, he needed the age of the fossil. the carbon-14 analysis indicates that only half of the original amount is present. how old is this fossil? 2.) the half-life of hydrogen-3 is 12.3 years. given 100 g of hydrogen-3, how many grams will be left after 5 half-lives? 3.) a patient is administered 20 mg of iodine-131. how much of this isotope will remain in the body after 40 days if the half-life for iodine-131 is 8 days? 4.) the mass of cobalt-60 in a sample is found to have decreased from 0.8 g to 0.2 g in a period of 10.5 years. from this info, calculate the half-life of cobalt-60.radioactivity worksheet?
i have to fill this out before monday, and the website our teacher gave us to do so does not exist. i have found most of the answers via google, i was hoping someone could help me with these. 6) __________ decay is the breaking up of a radioactive element, more often than not resulting in the formation of a new nucleus. 7) _________________ is the changing of an atom into another kind of atom that takes place during radioactive decay. 8) in the year __________, henri becquerel of __________ discovered radioactivity. 9) alpha radiation is actually a stream of (positively, negatively) charged particles. 10) beta radiation is actually a stream of (positively, negatively) charged particles. 11) whenever an element undergoes (alpha, beta, gamma) decay, it turns into another element with an atomic number two less than before and a mass number four less than before. 12) during (alpha, beta, gamma) decay, a neutron in the nucleus decays into a proton, an electron, and a neutrino. 13) the more stable a nucleus is, the (longer, shorter) its half-life. 17) (alpha particles, beta particles, gamma rays) travel at the speed of light. 18) the term radioactivity was coined by __________. 19) (alpha particles, beta particles, gamma rays) are not affected by a magnetic field because they carry no __________ charge. 20) an alpha particle is actually a nucleus of __________. 21) beta particles originate in the __________ of the atom. 23) the half-life of a given isotope can be altered by heat, pressure, or some other physical means. true or false.radioactivity worksheet?
i have to fill this out before monday, and the website our teacher gave us to do so does not exist. i have found most of the answers via google, i was hoping someone could help me with these. 6) __________ decay is the breaking up of a radioactive element, more often than not resulting in the formation of a new nucleus. 7) _________________ is the changing of an atom into another kind of atom that takes place during radioactive decay. 8) in the year __________, henri becquerel of __________ discovered radioactivity. 9) alpha radiation is actually a stream of (positively, negatively) charged particles. 10) beta radiation is actually a stream of (positively, negatively) charged particles. 11) whenever an element undergoes (alpha, beta, gamma) decay, it turns into another element with an atomic number two less than before and a mass number four less than before. 12) during (alpha, beta, gamma) decay, a neutron in the nucleus decays into a proton, an electron, and a neutrino. 13) the more stable a nucleus is, the (longer, shorter) its half-life. 17) (alpha particles, beta particles, gamma rays) travel at the speed of light. 18) the term radioactivity was coined by __________. 19) (alpha particles, beta particles, gamma rays) are not affected by a magnetic field because they carry no __________ charge. 20) an alpha particle is actually a nucleus of __________. 21) beta particles originate in the __________ of the atom. 23) the half-life of a given isotope can be altered by heat, pressure, or some other physical means. true or false.nuclear chemistry question?
question from a worksheet: most chromium atoms are stable, but cr-51 is an unstable isotope with a half-life of 28 days. after 168 days, how many half-lives will a sample of cr-51 have undergone? ans. = 6 half-lives (b) what fraction of a sample of cr-51 will remain after 168 days? ans. = 1/64 - i understand a perfectly, i just don't understand how they got the answer to b if anyone could explain it to me that would be great :) thank.