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Question 13 (1 point) If a radioactive sample has an activity of 65 Ci, how many...
If a radioactive sample has an activity of 65.0 nCi, how many disintegrations per second are occurring? 1,420 disintegrations/s 2,410 disintegrations/s 1,240 disintegrations/s 1,240 disintegrations/s 2,140 disintegrations/s
10 A sample of technetium-99 has an activity of 1.5 Ci. How many disintegrations occur in the technetium-99 sample in 5.0 sec? 1 Ci = 3.7 x 1010 disintegrations/s Group of answer choices: 5.6 × 1010 8.1 × 10–12 2.8 × 1011 2.0 × 10-10 1.1 × 1010
A wooden artifact has a 14C activity of 19.5 disintegrations per minute, compared to 27.5 disintegrations per minute for live wood. Given that the half-life of 14C is 5715 years, determine the age of the artifact. ___ x 10 ___ yr A 0.0108−g sample of a radioactive isotope with a half-life of 1.3 ×109 years decays at the rate of 2.7 ×104 disintegrations per minute. Calculate the molar mass of the isotope. ___ x 10 ___ g/mol
How much phosphorus-32 remains from a 6.00 g sample after each of the following number of half- lives: (a) 3; (b) 10? g of phosphorus-32 remains. g of phosphorus-32 remains. If a radioactive sample had an activity of 2.2 mCi, how many disintegrations per second does this correspond to? * 10 disintegrations/second
A radioactive substance has a decay rate of 0.064 per minute. How many grams of a 150 gram sample will remain radioactive after 45 minutes? Round the answer to the nearest tenth of a gram, and do not include the unit in your answer. Sorry, that's incorrect. Try again? 147.1
Question 19 Correct Mark 1.00 out of 1.00 By mass spectral analysis, a sample of strontium is known to contain 2.64x1010 atoms of Sr-90 as the only radioactive element. The absolute disintegration rate of this sample is measured as 1238 disintegrations per minute. Calculate the half-life (in years) of Sr-90. P Flag question Answer: 28.1 Question 20 Incorrect How long will it take (in years) for the disintegration rate of this sample to drop to 757 disintegrations per minute? Mark...
A freshly prepared sample of a radioactive isotope has an activity of 27.5 mCi. After 2.60 hours, the activity is 21.0 mCi. (a) Determine the half-life of the isotope. (h) (b) How many nuclei of the isotope were contained in the freshly prepared sample? (nuclei) (c) After how much time will the activity be 1.40 mCi? (h)
A freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After 3.80 h, the activity is 8.30 mCi. (a) Find the decay constant and half-life of the isotope. (b) How many atoms of the isotope were contained in the freshly prepared sample? (c) What is the sample's activity 30 h after it is prepared?
Sr-90 has a half-life of 29.1 years. How long will it take for the activity of a Sr-90 sample to decay from 5.3 times 10^3 dpm (disintegrations per minute) to 3 times 10^2 dpm? The half-life of a radioisotope is 3 d. What percent remains after 1 week?
explain 7 & 8 please
Question 7 1 pts The AC activity of an artifact from a burial site was 8.7/min.g C. The half-life of C is 5730 years, and the current activity is 16.1/min.g C (that is, 16.1 disintegrations per minute per gram of carbon). How old in years) is the artifact? Enter number to 1 decimal place. Question 8 1 pts Analysis of an ant found in a piece of amber provided 10 disintegrations of 14C/min.g C, whereas...