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A potassium-40 sample starts with 50 atoms and 1.25 billion years later there are 25 atoms. What is the half-life of potassium-40?
1.25 billion years
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What is the half-life of potassium-40 if a potassium-40 sample starts with 50 atoms and 1.25 billion years later there are 25 atoms?
The half-life of potassium-40 is 1.25 billion years since half of the original sample decays in that time. With 50 atoms initially, having 25 atoms remaining after 1.25 billion years aligns with the expected decay pattern for a half-life.
Uranium-235 has a half life of?
The half-life is 700 million years !
What is a number that starts with a B?
billion
What is a number that starts with the letter B?
billion
A uranium235 sample starts with 200 atoms and 700 million years later there are 100 atoms What is the halflife of uranium235?
700 milliion years. The definition of half-life is the period of time during which one-half of the atoms of an element undergo decay into other elements.
What is 2.7 billion in scientific notation?
Something that is a billion starts off with 109. Then, 2.7 billion in scientific notation is 2.7 x 109.
When did earth starts life?
4.5 billion years ago.
A potassium 40 sample starts with 50 atoms and 1.25 billion years later there are 25 atoms What is the half life of potassium 40?
1.25 billion years: 25/50 or half the original atoms have disintegrated in 1.25 billion years, and that is the definition of half life.
What starts with the letter r means something you analyze in a fingerprint sample?
RIDGE
The halflife of Na24 is 15 hours When there are 1000 atoms of Na24 in a sample a scientist starts a stopwatch The scientist stops the stopwatch at 45 hours there are atoms of Na24 rema?
There will be 125 atoms of Na24 remaining in the sample after 45 hours. This calculation is based on the fact that after 3 half-lives (45 hours/15 hours per half-life), the original 1000 atoms would have reduced by a factor of 2 three times, resulting in 1000/2/2/2 = 125 atoms remaining.
What is 7 billion in scientific notation?
Something that is a billion starts with base 109. Therefore, the term in scientific notation is 7.0 x109
What is the cost of opening an airport?
Ir starts at circa 5 billion dollars
