Hey there!
A half-life means after a certain amount of time, half of that substance will have decayed after that time.
An equation for exponential decay is the following:
y = a(1 - b)ⁿ
Where a is the original amount, b is the rate of decay, and n is time.
1000 is about 0.3 of a half life, 1000 divided by 138 days (3312 hours) is approximately 0.3.
Let's plug in values to that equation:
y = 321(1 - 0.5)^(0.3)
Simplify.
y = 260.73
There will be 260.73mg of polonium-210 remaining after 1000 hours.
Hope this helps!
The oil, even a little drop, will spread out over the water surface and break up into many little blobs.
Answer:
Sorry but i can't help
Explanation:
i need to really finesh s
Answer:
i fi am not wrong the correct answer is D
Explanation:
This is because it has a full outer valence shell! so there are 8 electrons and that means it doesn't have the urge the gain anymore