Biology, 24.02.2020 19:59 Bellaburrito

Calculating Half-Life
A sample of radium-226 will decay to % of its original amount after 3200 years. What is the half-life of radium-226?
years
tivity

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Answer from: Salamonti

Complete Question:

A sample of radium-226 will decay to 1/4 of its original amount after 3200 years. What is the half-life of radium-226?

1,600 years is the half life of radium-226.

Explanation:

The half-life (symbol $t_{1 / 2}$ ) is the time it requires or the time taken to reduce the amount to half of its original value. The term is often used in nuclear physics to describe how quickly unstable atoms are radioactive degrading or how long stable atoms remain.

There will be 100% presence of sample in zero half-life.

In first half-life, 50% available of sample ( $\frac{1}{2}$ left from the original)

Then second half life, 25% available of sample ( $\frac{1}{4}$ left from the original)

Here, given sample of radium-226 will decay to 1/4 of its original amount after 3200 years.

So, after two half life, sample of radium-226 will decay to 1/4 of its original amount. Hence, simply divide 3200 by 2 to find half-life.

$\frac{3200}{2}=1600 \text { years }$

Answer from: Quest

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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Calculating Half-Life
A sample of radium-226 will decay to % of its original amount after 3200...

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