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3 years ago

9

Why might an ecologist set up an artificial environment in a laboratory?

1 answer:

WINSTONCH [101]3 years ago

8 0

to imitate and manipulate conditions that organisms would encounter in the natural world

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Strontium-90 has a half life of 29 years, how much strontium-90 is left from the Chicago pile reactor that was active around 87

agasfer [191]

Answer:

The answer is below

Explanation:

The half life of a substance is the time required by that substance to reduce to half of its initial value. The half life is calculated using the formula:

$N(t)=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} } \\\\where\ N(t)=quantity\ of\ substance \ remaining, N_o=initial\ quantity\\of\ substance, t=time\ and \ t_\frac{1}{2}=half\ life\ of\ substance$

Given that t = 87 years, half life = 29 years, therefore the quantity of strontium-90 left is:

$N(t)=N_o(\frac{1}{2} )^\frac{87}{29} \\\\N(t)=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} } \\\\N(t)=N_o(\frac{1}{2} )^3\\\\N(t)=\frac{1}{8} N_o$

That is one-eight of Strontium 90 would be left after 87 years

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Mineral appears to emit green and blue light in the dark.

max2010maxim [7]

The answer would be b. Fluorescence

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Analog signals are like a ___________ because there is continuous variation in the data.

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3 cause it’s gives time-varying features

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Glycogen in _____ is broken down and released into blood when blood glucose is low.

WINSTONCH [101]

A is the of this question.

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Which process helps gas exchange to occur?

zavuch27 [327]

Hello Pgoodrichstat!

The process that helps gas exchange occur is called diffusion.

Cheers!
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