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QUESTION 19 if we start with 1.000 g of strontium-90, 0.908 g will remain after 4.00...
QUESTION 8 If we start with 1.000 g of strontium-90, 0.908 g will remain after 4.00 yr. This means that the half-life of strontium-90 is A. 3.05 B. 4.40 C.28.8 D. 3.63 E. 41.6
QUESTION 20 If we start with 1.000 g of strontium-90, 0.908 g will remain after 4.00 yr. This means that the half-life of strontium-90 3.05 4.40 28.8 3.63 41.6
If we start with 1.000 g of strontium-90,0.908 g will remain after 4.00yr.This means that the x of strontium -90 is --------------------------yr.
Part A A rock contains 0.102 mg of lead-206 for each milligram of uranium-238. The half-life for the decay of uranium-238 to lead-206 is 4.5 109 yr. The rock was formed years ago. 5.02. 108 3.81 108 7.23.108 4.59 108 5.49. 108 Request Answer Submit If we start with 1.000 g of strontium-90, 0.887 g will remain after 5.00 yr. This means that the half-life of strontium-90 is yг. 28.8 4.43 41.6 3.91 5.64 Request Answer Submit
QUESTION 19 A machine is worth $15.00 new and has a scrap value of $ 1.000. The machine is to be depreciated over a 10-year life. Find the value of the machine after 2 years. A. $13,500 B. $13.000 $14.300 D. $12.200 E. 14.000
The half-life of cesium-137 is 30 years. Suppose we have a 18-gram sample. (a) Find the yearly growth factor a. (Round your answer to five decimal places.) a = (b) Find an exponential model m(t) = Cat for the mass remaining after t years. m(t) = (c) How much of the sample will remain after 85 years? (Round your answer to two decimal places.) g (d) After how long will only 3 g of the sample remain? (Round your answer...
14.44 please explain on paper please with formulas step by
step
what is the partial We begin b) At what time will the th its initial value decomposition of the ulcum th an initial SO.Cl pressure of 150 torr. w ssure of this substance after 60 s? (b) At who nartial pressure of SO,Cl decline to one-tenth its in The first-order rate constant for the decompo N.O. 2 N,Os(8) — 4NO2(8) + O2(g), at 70 °C 10 . Suppose we...
1. The half-life of an element is 30 years. We start with 50 grams. Find a formula that gives the amount of the element remaining after h half-lives. Select one: a. 50 cross times 0.5 to the power of h b. 50 minus 0.5 cross times h c. 15 to the power of h d. 15 plus 0.5 to the power of h e. None of these 2. A bank account starts with $ 10. Every month, the amount in...
9. [-14 Points] DETAILS SPRECALC7 4.6.017. This exercise uses the radioactive decay model. The half-life of radium-226 is 1600 years. Suppose we have a 28-mg sample. (a) Find a function m(t) = moz-th that models the mass remaining after t years. m(t) = (b) Find a function m(t) = moet that models the mass remaining after t years. (Round your value to six decimal places.) m(L) = (c) How much of the sample will remain after 2500 years? (Round your...
question 18 & 19
18) For a certain hot system in contact with cool surroundings, the half-life time for loss of excess thermal energy to the surroundings is 10 minutes. This means what about the excess thermal energy? It is a) all gone in 20 minutes b) half gone in 5 minutes c ) half gone in 20 minutes d) all gone in 10 minutes e) none of the above 19 You have 400 ml of a saturated solution of...