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The half-life of Au-198 is 2.7 days When there are 800 atoms of Au-198 in a sample a scientist starts a stopwatch The scientist stops the stopwatch at 8.1 days there are atoms of Au-198 re?
At 2.7 days, half of the 800 atoms (400 atoms) would have decayed. At 8.1 days, three half-lives have passed, so only ( \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{8} ) of the original sample remains. Therefore, there are 100 atoms of Au-198 remaining in the sample after 8.1 days.
Is the sunset time when it starts or ends?
The sunset time is when the sun starts to go below the horizon, marking the end of the day.
What is a force that starts with a p?
One example of a force that starts with the letter "p" is the force of propulsion, which is the driving force that moves an object forward.
If an object starts to accelerate what is it called?
If an object starts to accelerate, it is called gaining speed or increasing its velocity. Acceleration is the rate at which an object's velocity changes over time.
What is another word for noise that starts with P?
Pandemonium is a synonym for noise. It means wild disorder and utter chaos.
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
Uranium-235 has a half life of?
The half-life is 700 million years !
What is a number that starts with a 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 a number that starts with the letter B?
billion
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.
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.
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
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
