39Cl decays by emitting a ?- particle. This decay process has a half-life of 5.56×101 min. If the initial mass of a pure sample of this isotope is 8.47 µg, determine the number of 39Cl nuclei remaining after 6.010×102 min. Report your answer to three significant figures in scientific notation.
39Cl decays by emitting a ?- particle. This decay process has a half-life of 5.56×101 min....
14C decays by emitting a β- particle. This decay process has a half-life of 5.72×103 yr. Answer the following questions about this process and report all answers to three significant figures. A. Determine the initial activity (in dis/yr) of a 5.81 mg sample of this isotope. B. Determine the time (in yr) that it takes for the activity of 14C to decrease to 8.39×107 dis/yr.
A) 13N decays with a half-life of approximately 10 min to produce 13C, a stable isotope of carbon. For a 1.0g sample of 13N, after one half-life, what mass of 13N remains? What has happened to the remaining mass? B) 223Ra decays by alpha emission with a half-life of 11.43 days. For a 1.0g sample of 223Ra, after one half-life, what mass of 223Ra remains? What has happened to the remaining mass?
Radioactive Decay - Half-life and Activity 1 Radioactive decay - Half-life Time 0 1000 21 31 750 N 1.000.000 500,000 250,000 125,000 62,500 31.250 15.625 7813 3.506 1.953 977 51 6 500 7 BI . 101 250 125 0 tie 21.234.41516171819, 1012 Time in multiples of A radioactive sample's half-life is 30.2 years. 1 year = 365 days, 1 day = 24 hours, 1 hour - 60 minutes, 1 minute = 60 seconds (a) Find its decay constant in year...
A 0.0116-g sample of a radioactive isotope with a half life of 1.3x109 years decays at the rate of 2.9x104 disintegrations per minute. Calculate the molar mass of the isotope. Enter your answer in scientific notation. (g/mol)
Phosphorus-32 (P-32) is used in nuclear medicine as therapeutic agent in the treatment of several diseases. P-32 has a half life of 14.3 days and decays directly to its ground state by emitting a beta-minus particle. The decay table for P-32 is given. There are no excited energy states or other radiation emitted during this decay; therefore, P-32 is referred to as a "pure beta emitter. A P-32 sample is prepared in the manufacturing site with an initial activity of...
The isotope 208^Tl undergoes β decay with a half-life of 3.1 min. (a) What isotope is produced by the decay? (b) How long will it take for 99.0% of a sample of pure 208Tl to decay? (c) What percentage of a sample of pure 208Tl remains un-decayed after 1.0 h?
The half-life of 82 35Br is 1.471 days. This isotope decays by the emission of a beta particle. a Gaseous HBr is made with Br-82. When the bromine isotope decays, the HBr produces H2 and the bromine decay product. Write a balanced equation for the decay of Br-82. Now, write a balanced equation for the decomposition of H82Br. b If a pure sample of 0.0150 mol of HBr made entirely with Br-82 is placed in an evacuated 1.00-L flask, how...
lodine 131 has a half life of 8 days and decays by a first order process (as is always the case for radioactive decay). How much of a 46 gram sample of iodine 131 will remain after 8 days? Report your answer in grams.
1.) What is the missing particle? 2.) Carbon-14 decays by beta emission and has a half-life of 5,730 years a.) Write the balanced equation for this reaction. b.) What percentage of a sample remains after 3,310 years? 3.) Bismuth-214 is an a-emitter with a half-life of 19.7 min. How long does it take for 75.0% of to decay?
The radioactive decay of thallium−206 to lead−206 has a half-life of 4.20 min. Starting with 5.30 × 1022 atoms of thallium−206, calculate the number of such atoms left after 42.0 min. Enter your answer in scientific notation.