The graph below shows the breakdown of radon-222.
What is the half-life of Rn-222?
What fraction of the original sample will be left after 3 half-lives?
Answers
Answer:
Answer: 7.949\ \text{days}7.949 days
Step-by-step explanation:
Given
The half-life of a sample is T_{\frac{1}{2}}=3.823\ \text{days}T
2
1 =3.823 days
Decay is given by
A=A_o2^{\dfrac{-t}{T_{\frac{1}{2}}}}A=A
o
2
T
2
1
−t
After 3 half-lives, one-eight of the sample is left
Insert the values
\begin{gathered}\Rightarrow \dfrac{A_o}{8}=A_oe^{\dfrac{-t}{T_{\frac{1}{2}}}}\\\\\Rightarrow e^{\dfrac{t}{T_{\frac{1}{2}}}}=8\\\\\text{Taking log both sides}\\\Rightarrow \dfrac{t}{T_{\frac{1}{2}}}=\ln 8\\\\\Rightarrow t=3.823\times \ln 8\\\\\Rightarrow t=7.944\ \text{days}\end{gathered}
⇒
8
A
o
=A
o
e
T
2
1
−t
⇒e
T
2
1
t
=8
Taking log both sides
⇒
T
2
1
t
=ln8
⇒t=3.823×ln8
⇒t=7.944 days
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Why is genetic variation important for the long term survival of a population?
Answers
Explanation:
According to Darwinism , the survival of the fittest , variation is important because it allows species to adapt to its environment , the stronger in traits is selected and the weakest is unable to adapt and die.
so , variation is the only way for a species to acquire new traits that can enable them to survive and adapt to their surroundings, Normally , Variation is very slow and it requires many generations for new traits to emerge , but it happens.
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Renewable resources are the resources which can never be exhausted. The difference between fresh water and coal is that, fresh water is a renewable resource, while coal is a nonrenewable resource.
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Generally, resources can be grouped under two categories, i.e. renewable and nonrenewable resources.
Renewable resources: The resources that can be grown again or in other words the resources that can never be exhausted are called renewable resources. Examples solar energy, fresh water, trees, etc.Non-renewable resources: These resources are present in a fixed amount in environment or one can say that these can never be replenished if exhausted once. Example coal, oil, fossil fuels, etc.Thus, the correct option is D.
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Answer:
D
Explanation:
During which life stage does a caterpillar create its chrysalis?.
Answers
Answer:
Pupa stage
Explanation:
When it has eaten enough, it will start to make its chrysalis It would hang on a branch that would Be suitable But the character is still alive eventually after a long time in there, it'll soon mutate into a butterfly, and it'll still be alive And then it'll Eggs Starting over again.
the diagram shows a beaker of water and molecules of red dye at the beginning of an experiment (time 1) and the same beaker of water and molecules of red dye after 30 minutes (time 2) which of the following best explains what happened?
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d- molecules of water moved by active transport from a higher concentration to a lower concentration
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Answer:
The answer is A. I seen it on Quiziz.
Explanation:
The diagram shows that the molecules of red dye moved by diffusion from a higher concentration to a lower concentration in a beaker of water.
What is diffusion?"It is a phenomenon in which a solute moves from its region of higher concentration to a region of lower concentration."It works towards the concentration gradient."Concentration gradient means difference in the amount of solute present in two areas."What do you mean by concentration?"The amount of solute present in a mixture is called concentration."When a dye is put in a beaker of water, it gets evenly distributed through diffusion.
Hence, the correct option is a. molecules of red dye moved by diffusion from a higher concentration to a lower concentration.
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Fracking process is dangerous and hazardous for all our environment and its organisms.
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In a population of short, ground-dwelling animals, some offspring were produced that were approximately 1 cm taller than others in the population. This group was able to reach slightly higher vegetation than the rest of the population. When these animals grew up, they were able to produce more offspring than other animals in the population. This pattern, where the tallest animals were more likely to survive and reproduce, continued over several generations. Eventually, after many generations, all members of the population were at least 20 cm taller than animals of the original population had been. What does this illustrate?
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Answers
Answer:
B. Slight differences between parents and offspring can eventually result in future generations that are very different from their ancestors.
Explanation:
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Answer:
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Humanistic psychologists allows growth by creating awareness and self-understanding. The influence of subjective personal experiences and beliefs is the base of the phenomenological approach.
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Answer:
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hello guys
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who ever answer it first right ill make it brainliest
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Answer:
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Answer:
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Answer:
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Answer:
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A student proposes that left-handedness is a recessive trait and is hidden in much of the human population. a survey of his class of 36 students finds that 9 students are left-handed. using the hardy-weinberg formula, what would be the expected allelic and genotypic frequencies in this theoretical population
Answers
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Answer:
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Answer:
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Explanation:
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Answer:
okay so the answer is C this is because the triplet found on tRNA is anticodons not codons. please. rate. me. brainliest
help please:) biology
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Explanation:
i did it and got it right
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Answer:
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