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A researcher measures 200 counts per minute coming from a radioactive source at noon. At 300pm she finds that this has dropped to 25 counts per minute. What percentage of the original source will rema?
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How do you determine the half life of a radioactive substance that has changed through radioactive decay After 40 days the original substance left is is one sixteenth of the original amount?
the halflife is 10 days
What happens to a radioactive material over time?
It disintegrates into its daughter nuclei that are much more stabler than the radioactive nuclei. If a sample of radioacictive material is left it will decay into another element over a period of time. Note that complete decay is not possible. A fraction of the original radioactive material will always remain in the sample.
What percentage of a radioactive species would be found as daughter material after seven half lives?
The equation for half-life is AT = A0 2 (-T / H) where A0 is the starting activity, AT is the activity at some time T, and H is half-life in units of T. As a result, seven half-lives would be 2(-7) or 0.0078125 of the original activity.
What is torsion strength?
Torsion strength measures the largest torsion force the material can withstand and still spring back into its original shape.
After three half lives have passed how much of the original radioactive material will remaim?
1/8th gram will be left. That's your answer.
What is the percentage of radioactive nuclei left after 3 half lives have passed?
12.5%
How is radioactive decay used to determine the absolute age a rocks?
The basic idea is to measure the amount of the radioactive isotope, and of one or more of its decay products. The older the rock, the larger the percentage of the original isotope that decayed - so the ratio between the original isotope and the decay product changes over time.
The original sample of a radioactive substance?
Yes, and the question is ... ?
What is the loss percentage?
It is the percentage decrease of an item from its original value. It is worked out as: (original value-loss)/original value times 100 = percentage loss.
How do you determine the half life of a radioactive substance that has changed through radioactive decay After 40 days the original substance left is is one sixteenth of the original amount?
the halflife is 10 days
What is a summary of a source is usually?
A summary of a source is usually _____shorter than the original and in the researcher's own words.
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 do you find loss percentage?
(New amount - Original amt) / Original amount = loss percentage. saurabh K.
How is radioactive decay useful in dating rocks and minerals?
Radioactive decay has a constant rate of change, therefore it con be used to somewhat accurately tell the age of an object if you work backwards through the use of half-lifes (half of the existing radioactive material decays, leaving half of the original in its original form)
What types of elements are useful for dating materials?
Radioactive elements are used to date the age of rocks. Radioactive elements decay according to a known pattern. Scientists can use the elements of that pattern to determine when the rock with the original radioactive element was formed.
The atom that remains after a nucleus disintegrates is what?
smaller than the original atom and possibly radioactive
In a nuclear disintegration the particle that is ejected may be?
It is smaller than the original atom and is possibly radioactive.
