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madreJ [45]
2 years ago
6

I have no idea so i'm screwed please help me

Physics
1 answer:
podryga [215]2 years ago
8 0

Answer:

Let N0 be the initial atoms of Be11

N0 / 2^1 = N0 / 2  Number of Be11 after 1 half-life

N0 / 2^2 = N0/ 4   Number of Be11 after 2 half-lives

30/13.81 = 2.17 half lives

N0 / 2^2.17 = N0 / 4.51 = .222 N0 or 22.2 % of atoms remain

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Answer:

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2 years ago
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denis23 [38]
<h3><u>Full Question:</u></h3>

Which explanations provide support for continental drift theory? Check all that apply.

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Similar rock types are found across continents.

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Coal fields match up across continents.

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Evidence of glaciers can be found in South Africa.

<h3><u>Explanation:</u></h3>

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The best and most correct answer among the choices provided by your question is the third choice or letter C.
<span>
Two minerals that have different arrangements of their atoms may have different physical properties.</span>


I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
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Answer:

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Answer:

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4 0
2 years ago
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