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How many half-lives have passed for 50 percent of the original radioactive material?
Wiki User
∙ 8y ago
One half-life.
Wiki User
∙ 8y ago
Wiki User
∙ 8y agoOne.
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After three half-lives what percent of the radioactive isotope is remaining?
12.5% is remaining.
Why does the percent ionization of acetic acid increase as the concentration of the solution decreases?
As you increase the concentration of the solution, the concentration of H+ does not change. Meaning, the concentration ionized does not change. Just the original concentration increases. Since percent ionization = (concentration ionized)/(original concentration) , and the original concentration is increased, the percent ionization therefore decreases.
How do you refine 90 percent silver to 100 percent silver?
You can't because part of the coin is from another material, if you melt out the silver you are still left with the other material. So the coin is made from 90% silver 10% something else.
After one half-life what percent of the original uranium remains?
By definition, 50%. Half life is the time for half of the original sample to decay.
What does carbordating mean?
Do you mean carbon dating? Carbon dating is a process that scientists use to try to ascertain the age of an item by analyzing the amount of a radioactive carbon isotope that is present in the item. Generally this is used to date biological items. Like, really old trees and stuff. The percent of the radioactive isotope in the specimen is accumulated to normal levels as the thing was alive, after it is dead it stops absorbing new carbon and thus by measuring the ratio of isotopes that are decaying we can determine the age of the item. (using the half-life of the radioactive isotope)
How old is a fossil that has a radioactive material with a half life of 200 years if there is 25 percent of the original radioactive material left?
400 yrs
How much of a 3.0cm material is needed to reduce beam of radiation to 25 percent of its original intensity?
The answer depends on the transmissivity of the material.
How is tossing a coin similar to radioactive decay of an element?
If you toss a coin, there are fifty percent chances of getting the head or tail. In the radioactive decay also fifty percent atoms will brake down. When you toss the coin next time, you have 25 percent chances of getting the head or tail repeated. Same is the case with radioactive material. you will be left with 25 percent of the radioactive material after half life. Third time the chances of getting the same head or tail is 12.5 percent. Here you are left with 12.5 percent of the radioactive material left with after another half life.
If a radioisotope has a half life of 400000 years and only 6.25 percent of the original radioisotope was present in a rock how old is the rock?
after 4 half ives the radioactive material becomes 6.25% so age of the rock is 400000 x 4 = 1600000 years or 1.6 Million years.
A sample of radioactive isotope has a halflife of 1 day how much of the original sample will be left at the end of the fourth day?
If a sample of radioactive material has a half-life of one week the original sample will have 50 percent of the original left at the end of the second week. The third week would be 25 percent of the sample. The fourth week would be 12.5 percent of the original sample.
Tritium has a half life of 12.3 years if 118mg escapes what percent of the spill will remian radioactive in 61.5 years?
3.13% will be radioactive at that point.
After three half-lives what percent of the radioactive isotope is remaining?
12.5% is remaining.
How many Percent does the original remains of the Philippine Forest have?
20 percent of the original remains of the Philippine forest
What percent expresses a 5 percent decrease in the original whole?
95% You simply subtract the decrease from the original 100%.
How do you do Percent of change?
percent of increase-new-original over originalthen make the decimal a percent of increasepercent of decrease-original-new over originalthen make the decimal a percent of decrease
How do you do percent change?
percent of increase-new-original over originalthen make the decimal a percent of increasepercent of decrease-original-new over originalthen make the decimal a percent of decrease
What is the percent decrease from 220 to 33?
Percent Decrease = (Original Amount - New Amount)/(Original Amount) * 100% The percent decrease from 220 to 33 is 85%
