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Why After three half-lives what fraction of a radioactive sample remains?
After three half-lives, only 1/8 (or 12.5%) of the original radioactive sample remains. This is because each half-life reduces the amount of radioactive material by half, so after three half-lives, you would have (1/2) * (1/2) * (1/2) = 1/8 of the original sample remaining.
What happens to the mass of food when burned?
When food is burned, the mass of the food remains constant. However, the chemical bonds in the food molecules break, releasing energy in the form of heat and light. The ash residue that remains after burning is a fraction of the original mass and consists of the non-combustible components of the food.
The half life of Rn-222 is 4 daysWhat was the original mass of a sample of this isotope remains after 21 hrs?
The half-life on 222Rn86 is 3.8235 days. A sample of this isotope will decay to 0.8533 of its original mass after 21 hours. AT = A0 2(-T/H) AT = (1) 2(-21/(24*3.8235)) AT = 0.8533
How much of a sample of radioisotope remains after one half-life?
One-half of the original amount. That's precisely the definition of "half-life".
What fraction of a radioisotope is remaining if it undergoes six half-lives?
If a radioisotope undergoes six half-lives, only (1/64) or (0.015625) of the original radioisotope remains, because half of the remaining material decays at each half-life.
After three half-lives what fraction of a radioactive sample remains?
1/8 of the original amount remains.
What fraction of an original sample of a radio isotope remains after 3 half-life periods?
One eighth remains.
If a substance has. A half-life of 5 million years what fraction of the atoms remain after ten million years?
A quarter remains.
What fraction of an original 20.00gram sample of nitrogen-16 remains unchanged after 36.0 seconds?
2
If the age of the Earth is 4.5 billion years and the half-life of 40K is 1.26 billion years what percent of the Earth's original amount of 40K remains today?
Approximately 25% of the Earth's original amount of 40K remains today, given that one half-life of 40K is 1.26 billion years. This means that half of the original amount decayed in 1.26 billion years, leaving behind the remaining 50%, which is now further decaying to reach 25% after 4.5 billion years.
What is the half life of uranium 238 if 85.719 percent of any given amount remains after 1 billion years?
The halflife of 235U is 704 million years. 1420 million years is approximately two halflives, so about 24.7% would be remaining.
Why After three half-lives what fraction of a radioactive sample remains?
After three half-lives, only 1/8 (or 12.5%) of the original radioactive sample remains. This is because each half-life reduces the amount of radioactive material by half, so after three half-lives, you would have (1/2) * (1/2) * (1/2) = 1/8 of the original sample remaining.
How old is a rock for which you determine that 55 percent of the original uranium-238 remains while the other 45 percent has decayed into lead?
The rock would be approximately 1.51 billion years old. This estimation is based on the known half-life of uranium-238, which is about 4.5 billion years. By determining that 55 percent of the original uranium-238 remains, you can infer the age of the rock by calculating how many half-lives have passed.
What does an improper fraction become when it is reduced?
It remains an improper fraction.
When dividing the numerator and denominator of a fraction by the same and 8203 non-zero number what happens to the value of the original and 8203 fraction?
When you divide both the numerator and denominator of a fraction by the same non-zero number, the value of the fraction remains unchanged. This is because you are essentially scaling both parts of the fraction equally, which does not affect its overall ratio. For example, if you have the fraction ( \frac{a}{b} ) and you divide both by ( c ) (where ( c \neq 0 )), the fraction simplifies to ( \frac{a/c}{b/c} ), which is equivalent to the original fraction.
What fraction of a sample remains after three half lives?
An eighth remains.
Is it false that dinosaur footprints are original remains?
Yes, it is false that dinosaur footprints are original remains.
