If radio active substance that weight5600grams and half-lifeof 100years is left with 700 grams for how long has the decaying activity been undergoing?
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Ответ:
If you have a 120 gram sample of a radioactive element, how many grams of that element will be left after 3 half-lives have passed?
Solution
Given: mass of radioactive sample of an element, number of half-lives
Asked to Solve For: mass of radioactive element after so many half-lives
Solve:
All radioactive samples lose half of their mass after each half-life. Thus, one solution is to calculate the mass after each half-life. (This method only works if you are asked to solve for a whole number of half-lives). Let the passing of time equal to one half-life be represented by and arrow, →. Then the solution is:
120 g → 60 g → 30 g → 15 g
If you want to solve for any number of half-lives, including fractional half-lives, then you use the equation: amount remaining = (12)n(amountatstart) , where n= number of half-lives. Then the solution is:
amount remaining = (12)3(120g)=15g
Explanation:
Ответ:
15g
amount remaining (12)3(15)= 15g
Ответ:
Explanation:
They are aquatic — found in moist or wet places.They are autotrophic, and the reserve food is generally Starch.They consist of a cellulose cellwall around their cells.Mechanical and conducting elements are absent in thallophyta.Plant body is thallus, not differentiated into root, stem and leaves