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After three half-lives what fraction of a radioactive sample will remain?
Approx 1/8 will remain.
How do you change 2 13 into an improper fraction?
2/13 cannot be written as an improper fraction since [the absolute value of] its numerator is less than [the absolute value of] its denominator. It will remain a proper fraction.
How do you write 2 and 3 over 8 as improper fraction?
The numerator of the improper fraction will be 2*8 + 3 = 19 and the denominator will remain the same as that for the fractional part of the mixed fraction. So the improper fraction is 19/8.
Is 7 over 8 less than 3 over 4?
No. Remember that when you multiply the top (numerator) and the bottom (denominator) of a fraction by the same number, the value of the fraction will remain the same. So, if we take your fraction, 3/4, and multiply the top and bottom by two (we are really multiplying by 2/2, which equals 1), we get 6/8. Simple examination now tells you that 7/8 is greater than 6/8. This method is called "finding a common denominator", and is very useful.
Do 2 negatives in a fraction equal a positive?
Well, honey, in math, two negatives in a fraction do indeed equal a positive. It's like when you owe someone money, and then owe them more money - suddenly you're in the green! So yes, in the world of math, two negatives make a positive when you're dividing.
If a radioactive material has half a life of 10 years what fraction of the material will remain after 30 years?
There will be 1/8 remaining.
After three half-lives what fraction of a radioactive sample will remain?
Approx 1/8 will remain.
What fraction of a radioactive nuclei remain after p half lives?
The remainder is 2-p or 0.5p of the original amount.
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.
How much parent material will be left after five half-lives?
Only 1/32 of the original radioactive material will remain. (½)5 = 1/32
What emits radioactive material as it gets older?
The type of radiations remain the same during time for a specific isotope.
Will the radioactive property remain in an ionic compound when a metal element is highly radioactive combined with a non-metal element which is non-radioactive?
A radioactive material is radioactive. Period. The atoms of radioactive material have unstable nuclei. If you combine them with other material, the radioactive material will remain unaffected as regards its radioactivity. Recall that radioactivity is related to the instability of atomic nuclei, and the atomic structure of atomic nuclei are (in general) not involved in chemical bonding. Chemical bonding doesn't affect the stability of the nuclei of atoms. If they are unstable, they will remain so whether the atoms are alone or chemically combined with something else.
How long does ionizing radiation last?
Ionizing radiation lasts for as long as the radioactive material emitting it remains radioactive. The duration can vary depending on the half-life of the specific radioactive isotope involved. Some isotopes may last seconds to minutes, while others can remain radioactive for thousands of years.
How long will a material from a power plant remain radioactive?
All radioactivity decays with time. Some fission products from uranium fission will remain active for thousands of years, others decay to insignificance within a few years.
After three half lives have passed how much of the original radioactive material will remaim?
After three half-lives, 12.5% of the original radioactive material will remain. Each half-life reduces the amount of material by half, so after three half-lives the remaining material will be 0.5^3 = 0.125 or 12.5%.
How is the importance of half-life an important consideration surrounding the use of nuclear power storage of nuclear waste?
The halflife of a particular isotope simply tells how long it will remain dangerously radioactive. By storing the spent fuel rods on site much of the shorter lived more intense radiation will have decayed before moving it to a long term repository.
What fraction of a radioactive sample remains after three half-lives?
Not sure what you mean by "had-lives". After 3 half lives, approx 1/8 would remain.
