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How much of a 4.0 mg sample is still active after 75 min if the half-life of bromine-74 is 25 min?
If the half-life of bromine is 25 minutes, than in 75 minutes three half lives would have passed. If you started with a 4.0 mg sample, than after three half-lives only 0.50 mg would remain. Because you are dealing with a whole number of half lives, all you have to do is divide 4.0 by 2 three time. Alternatively, you could multiply 4.0 by one half raised to the third power. This would look like this when entered into a calculator: 4.0 X (0.5^3) = 0.5
What else can I help you with?
What happens to particles when an ice cube melts?
The ice cube (solid) particles are compact tightly together. Yet, when the temperature of the ice cube increases then the particles become more active and begin to move apart except they are still attracted to one another.
What day month and year did slavery end in?
There are parts of the world where it can still be found. There are parts of the world where it can still be found. There are parts of the world where it can still be found. There are parts of the world where it can still be found.
Is the compass still used today?
Yes. People (and vehicles) still need to know where they are going.
What is the comparative of still?
stiller
If a set of ordered pairs is not a relation can the set still be a function?
If a set of ordered pairs is not a relation, the set can still be a function.
Does America still have paratroopers on active duty?
yes they still do there are many active paratroopers on active duty still to this day.
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Cassini is still active but Huygens is not.
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What tribes are still active?
The tribes that are still active are the Sioux Tribe. The other tribes are not that active. But the Sioux tribe is the most active tribe out of all of them.
Do volcanoes that aren't active can they still be active?
Yes, they can.
Is Rangitoto island still active?
Is Rangitoto active?
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First of all, why did you write: ...Many years 'was' active. They are still active. They have been active from 1998 - 2010 (but are still going)
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It is still active, because some smoke is still rising from it.
Is Memphis Publishing Company Still Active?
yes the Memphis Publishing Company is still active
Why are the Commonwealth Games still held?
The Commonwealth Games are still active because the Commonwealth of Nations is still a very active organisation.
Is mount Tambora an active volcano?
yes it is still active
Is Mount Tongariro an active volcano?
yes, it is still active.
