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larisa [96]
3 years ago
15

How could research on mice or rats help answer our medical research questions — questions that are, after all, about humans?

Biology
1 answer:
GenaCL600 [577]3 years ago
4 0

Answer:

you could disect them or observe what they do by doing things like putting them in a maze or seeing what they do in front of a mirror.

Explanation:

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If 1/8 remains after 21 years, what is the half-life?
vagabundo [1.1K]

Half life formula

The number of unstable nuclei remaining after time t can be determined according to this equation:

N(t) = N(0) * 0.5^(t/T)

where:

N(t) is the remaining quantity of a substance after time t has elapsed.

N(0) is the initial quantity of this substance.

T is the half-life.

It is also possible to determine the remaining quantity of a substance using a few other parameters:

N(t) = N(0) * e^(-t/τ)

N(t) = N(0) * e^(-λt)

τ is the mean lifetime - the average amount of time a nucleus remains intact.

λ is the decay constant (rate of decay).

All three of the parameters characterizing a substance's radioactivity are related in the following way:

T = ln(2)/λ = ln(2)*τ

How to calculate the half life

Determine the initial amount of a substance. For example, N(0) = 2.5 kg.

Determine the final amount of a substance - for instance, N(t) = 2.1 kg.

Measure how long it took for that amount of material to decay. In our experiment, we observed that it took 5 minutes.

Input these values into our half life calculator. It will compute a result for you instantaneously - in this case, the half life is equal to 19.88 minutes.

If you are not certain that our calculator returned the correct result, you can always check it using the half life formula.

8 0
3 years ago
In some parts of the world, rain forests are being cut down to make land available for homes, businesses, and farms. How does th
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Well the more that get cut down, the less oxygen we get, aswell as more carbon in the atmosphere because there is less trees to absorb it.

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3 years ago
PLEASE HELP ME FOR THE SAKE OF INKWELL ISLES
Veronika [31]

Answer: d

Explanation:

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2 years ago
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Answer: 13 to 20 days

Explanation:

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Because of the large heat of __________ of water, the evaporation from a liquid surface is a very effective cooling mechanism. T
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Because of the large heat of __________ of water, the evaporation from a liquid surface is a very effective cooling mechanism.

Vaporization

The human body makes use of evaporative cooling by __________ to give off energy even when surrounded by a temperature higher than body temperature.

Perspiration

~Hope this answers your question!~

4 0
3 years ago
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