Answer:
Option C. 2 half lives.
Explanation:
The following data were obtained from the question:
Original amount (N₀) = 1000 atoms
Amount remaining (N) = 250 atoms
Number of half-lives (n) =?
Half-life is defined as the time taken for the substance to reduce to half its original side. Mathematically, it can be obtained as follow:
N = 1/2ⁿ × N₀
N is the amount remaining.
n is the number of half-lives.
N₀ is the original amount.
Using the above formula, we can obtain the number of half-lives as follow:
Original amount (N₀) = 1000 atoms
Amount remaining (N) = 250 atoms
Number of half-lives (n) =?
N = 1/2ⁿ × N₀
250 = 1/2ⁿ × 1000
Cross multiply
250 × 2ⁿ = 1000
Divide both side by 250
2ⁿ = 1000/250
2ⁿ = 4
Express 4 in index form
2ⁿ = 2²
n = 2
Therefore, it will take two (2) half lives for the amount to get to 250 atoms.
Answer:
Explanation:
The water table can be lowered if too much groundwater is pumped out.
The water table can collapse if overpumped, creating a cave
Lakes and streams are surface expressions of the water table.
Answer:
The largest cities in Ouachita Mountain subdivisions are: Hot Springs and Mena (Polk County). Other smaller county’s include: Mount Ida (Montgomery County), Glenwood (Pike County), Jessieville (Garland County), and Caddo Gap (Montgomery County).
I hope this is what you were looking for!
Answer:
The answer is C. Berlin
It's the country capital of Germany
