![kloekamakeeaina14](/avatars/24430.jpg)
kloekamakeeaina14
01.07.2019 •
Mathematics
Acertain radioactive isotope decays at a rate of 0.3% annually. determine the half-life of this isotope, to the nearest year
Solved
Show answers
More tips
- F Food and Cooking Аэрогриль: Все, что нужно знать для подготовки здоровой и вкусной пищи...
- G Goods and services How to choose a washing machine?...
- F Family and Home Is it Worth Knowing the Gender of Your Child Before Birth?...
- H Health and Medicine Mercury Thermometer Danger: What to do when a thermometer breaks?...
- F Food and Cooking How to cook crayfish? Everything you need to know...
- G Goods and services LED-подсветка в LCD-телевизорах: 5 причин, почему она лучше других технологий...
- P Photography and Videography Understanding HDR: How It Works and Why You Need It...
- G Goods and services Which TV is better - LCD or Plasma?...
- S Sport How to Learn to Pull Up on Monkey Bars?...
- L Leisure and Entertainment Scrapbooking: What is it and Why is it Becoming More Popular?...
Answers on questions: Mathematics
- M Mathematics Two hundred seventy-three divided by twenty-four...
- M Mathematics Maria bought 14 oranges. Each orange weighed 0.44 pound. How many pounds of oranges did Maria buy? M...
- M Mathematics a water tank at the reservoir in east falls off henry ave, currently holds 12 gallons of water. if the tank is being drained at a rate of 14 gallons per minute, how long...
- M Mathematics Angle acb is congruent to dce angle b= 61 angle c= 57 angle d= 2x x=...
- M Mathematics A culture of bacteria has an initial population of 110 bacteria and doubles every 6 hours. Using the formula P = Po - 2ả, where Pt is the population after t hours, Po...
- M Mathematics Which math expression means the quotient of 39 and 13 ? A. 39 - 13 B. 39 - 13 C. 39.13 D. 39 + 13 Will give brainy...
- M Mathematics Use the Intermediate Value Theorem to show that there is a root of the given equation in the specified interval. x4 + x − 7 = 0, (1, 2) f(x) = x4 + x − 7 is ---Select---...
- M Mathematics I hate F*ing life here free points...
- M Mathematics A) John wants to buy a house and is trying to figure out how much money he needs for the down payment. If the house costs $275,000 and the down payment is 15% of the...
- M Mathematics Select all the ways you can tell that there is no solution to a system of equations. A. The equations have different slopes and have the same y-intercepts. B. The equations...
Ответ:
This could be rephrased as:
You start with 100 grams of a substance. One year later you have 70 grams. What is the half-life?
We need this formula:
half-life = (time * natural log (2)) / natural log (beginning amount / ending amt)
half-life = (1 year * .69315) / natural log (100 / 70)
half-life = (.69315) / 0.35667494396
half-life = 1.9433661145 years
Rounding to nearest year half-life = 2 years
Sourse: https://www.1728.org/halflif2.htm
(See problem 3)
Ответ: