The half-life of Pu-240 is 6,561 years.
Half life can be modeled by the function
f(x) = P(0.5)^x
P is our starting amount.
x is the number of half-lives required to equal f(x).
f(x) is the amount left after x half-lives.
9 = 27(0.5)^x
1/3 = 0.5^x
log(0.5)1/3 = x
x = 1.585
6.561 years * 1.585 half-lives = 10,399.185 years.
Answer:
The US democracy has slowly become more powerful
Explanation:
since the World Wars, the United States has had to show more power, as a world leader. The Untied States has helped rebuild more and more economies, and helped out other nations, adding more and more power to their democracy.
Answer: True
Explanation:
The scientific method is a process for experimentation that is used to explore observations and answer questions. ... Even though we show the scientific method as a series of steps, keep in mind that new information or thinking might cause a scientist to back up and repeat steps at any point during the process.
Answer:
A) Increased oxygen levels in a pond due to fertilizer run off
Explanation:
When fertilizer is applied to a farm during the day, rain could fall after the application, and as a result of errosion, some amount of the fertilizer could be washed away into the ponds due to run off, and some of the chemical components of fertilizer are poisonous to the fish, development of algae in the pond can reduce light needed in by the fish and oxygen could as well be reduced.
Explanation:
They were organised based on clans and their leaders were therefore clan heads. Economically the Bantu were cultivators, who grew crops like millet and bananas. The early coastal settlers also carried out fishing. Wild animals were also hunted by the coastal people for their meat.
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