0
Half life problem as follows at 80 min 45 percent of original amount remains What is the half life of the substance showing all work?
Half life is the time for one half of a radioactive substance to decay. In the second half life, another half decays, leaving one quarter. In the third half life, another dalf decays, leaving one eights. And so on and so forth...
The equation for the amount left after N half lives is...
AN = A0 2(-N/H)
...where H is the half life.
In the question asked, if 0.45 of a substance remains after 80 minutes, what is the half life, simply plug in the observations and solve...
0.45 = 2(-80/H)
log2(0.45) = log2(2(-80/H))
-1.152 = -80/H
H = 69.44 minutes
What else can I help you with?
What are the particles in a soulotion?
Particles in a solution are typically the solute and the solvent. The solute is the substance that is dissolved, while the solvent is the substance in which the solute is dissolved. These particles are dispersed uniformly throughout the solution.
How do I convert a .06 percent selenium to 90ppm?
To convert 0.06% selenium to ppm, you need to multiply by 10,000. Therefore, 0.06% selenium is equivalent to 600 ppm. To convert 600 ppm to 90 ppm, you would need to dilute the solution by a factor of 6.67 (600 ppm / 90 ppm).
What is a solution?
A liquid with something dissolved in it
What does a solution mean?
A solution can have many definitions. It would mean the act of solving a problem or the state of being solved or the process of determining an answer to a problem. You can find definitions like these on dictionary.com
What is the definition for the word observation?
To gather data or information related to the problem. Observation is either qualitative if it has something to do with the nature or quality of a substance or quantitative if it has something to do with the amount of the substance.
How do you solve a commission problem where you need to find the original price?
Commission = percent x original price / 100 so original price = commission x 100 / percent
How do you take out a percent of a number in a math problem?
Multiply the number by the percent in decimal form, and subtract the result from the original number. Alternatively, multiply the number by (1 - the percent).
What is the value of a preferred stock that pays a perpetual dividend of 75 at the end of each year when the interest rate is 4 percent?
The formula for this problem is as follows: PV(perpetuity)=CF/i With the application of the numbers from this problem, you would plug them in as follows: 75/.04 = $1875 < your answer. Hope that helps
Why is drug addiction a main problem in the Philippines?
Drug and substance abuse affect almost 10 percent of the Philippine youth. This situation is always attributed to poverty.
If The sales price of a car is 12590 which is 20 percent off the original price What is the original price?
Designate the original price as p. Then, from the problem statement, 80 % of p = 12590; p = 12590/0.80 = 15738. (If "20 percent" is considered to have only two significant digits, this should be written as "1.6 X 104 instead.)
What are the steps to solve a percent change problem?
To find the percentage change:find the change as in new value - original value; this can be a negative amount which implies a reductiondivide the value found in step 1 by the original value;multiply by 100 %percentage change = (new value - original value)/original value × 100 %
What is 15 percent off of 300?
the answer is $2.65 if you need to find out another problem like this take the percent you are getting off and multiply it by the price of the thing you are buying then subtract your answer off of the original price then you got your answer
What was the original problem the gas mask was designed to address?
What was the original problem the gas mask was designed to address
How do you figure out a problem that wants to know the original price and gives you the amount of discount?
Let x equal the original price. Let's say the sale is 25 percent off. That means that 0.75x = the sale price. To find the original price, divide the sale price by the decimal equivalent of 100 minus the discount. Example: You bought an item for 48.00 that was marked as being 20 percent off the original price. The original price was 48.00 divided by 0.80 or 60.00
What percentage of 30 percent is 20 percent?
find what percent of 30 is 20 how do you get this answer to this problem
Does Gary richrath have a substance problem?
yep
How does solving a simpler problem help you solve the original problem?
You gain relevant insights from solving that one problem, and then you can use those insights to help guide you to the solution of the original problem.
