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andrew-mc [135]
3 years ago
10

How are the asthenosphere and the lithosphere different?

Biology
1 answer:
Rashid [163]3 years ago
8 0
Earths lithospere is solid and sits on top of the softer asthenosphere.
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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
Circulation to and from the lungs is referred to as
horsena [70]

Answer:

pulmonary circulation

Explanation:

The pulmonary circulation moves the blood between the lungs and heart. Since the blood carries oxygen the heart pumps it to every body part including the lungs so we can maintain homeostasis.

8 0
3 years ago
One type of bacteria reproduces once every 60 minutes. If there are 2 bacterial cells to begin with, then after 4 hours there wi
wolverine [178]

Answer:

6 bacterial cells

Explanation:

Hope this is helpful!!

4 0
2 years ago
Read 2 more answers
Several species of fish in the genus Astyanax occur only in the waters in completely dark underground caves. These blind cave fi
Sunny_sXe [5.5K]

Answer:

a vestigial structure

Explanation:

Vestigial structures are a rudimentary (or even functionless) version of a body part, but they have important functions in a closely correlated or evolutionarily close species, an example of which is the presence of eyes in fish of the genus Astyanax. The existence of these vestigial structures is strong evidence that evolution occurs in organisms, since this structure, today without much apparent function, may in the past have been extremely important to the ancestors of that species.

7 0
3 years ago
Read 2 more answers
Alyssa finds an organism in her yard that is growing underneath an old fencepost. It lives in a very dark, moist environment on
shusha [124]
Fungi because of the rotting and in moist places
8 0
3 years ago
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