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3 years ago

How many half-lives have passed when there are three times as much daughter isotope as parent isotope?

Geography

1 answer:

Lorico [155]3 years ago

6 0

Answer:

3 half live have passed.

Explanation:

After 1 half-life , 500 g of the parent isotope will remain. After 2 half-lives , 250 g of the parent isotope will remain. After 3 half-lives , 125 g of the parent isotope will remain.

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An example of interaction in an ecosystem is _____.

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C. Birds eating seeds from plants

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2 1. Scattering cross-section of acrosol particles is 2.5E-12 m , absorption cross-section is 0.45E- .2 12 m Concentration of pa

Alona [7]

Answer:

$T = 3.23 \times 10^{-83}$

Explanation:

thickness of aerosol layer is 2.5 km

zenith angle is 40 degree

we know that

$\tau = \epsilon_{ext} . h$

where

$\epsilon_{ext} = N.\sigma_{ext}$

$\epsilon_{ext}$ is extinction coefficient

$\sigma_{ext}$ extiction cross section

N = Concentration

$\sigma_{ext} = (2.5 + 0.45)\times 10^{-12} m^2$

$= 2.95 \times 10^{-12} m^2$

$\epsilon_{ext} = 2\times 10^7 \times 2.95 \times 10^{-12} m^2 \times m^{-3}$

$= 5.9 \times 10^{-5} m^{1}$

$\tau = 5.9 \times 10^{-5} m^{-1} \times 2.5\times 10^3 m$

$= 14.75\times 10^{-2}$

transimiitance $T = e^{\frac{-\tau}{\mu}}$

$T = e^{\frac{- 14.75 \times 10^{-2}}{cos 40}}$

$T = 3.23 \times 10^{-83}$

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3 years ago

Higher atmospheric temperatures cause glaciers to melt more quickly. The melting of exposes new bedrock and ocean water absorb m

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Answer:

the concept that best represents the situation described here is: Thermal runaway or positive feedback. Higher atmospheric temperatures cause glaciers

Explanation:

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2 years ago

How did tropical cyclone Ana affected lives in Madagascar

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An estimated 21,000 people have been affected by the cyclone, many of them children. In addition, at least 77 classrooms and six health centres have been partially or completely destroyed, leaving 2,000 students out of school and communities without access to health services.

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Based on the map of religon, the religion that is most practiced in the southern part of Africa is

vladimir2022 [97]

Answer:

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Explanation:

The map shows that the majority of South Africans practice Christianity.

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2 years ago