A radioactive substance has a half-life of 1.25 million years. What is the age of a rock in which 6.25% of the original radioactive atoms remain? 5 million years old 6.25 million years old 3.75 million years old6 2.5 million years old 1.25 million years old 625 thousand years old
Answers
Answer:
The age of the rock is 5 million years
Explanation:
Fraction of radioactive substance remaining = 6.25% = 625/10000 = 1/16
Number of half-lives undergone by the substance to leave behind 1/16 of the original sample
1/16 = (1/2) * (1/2) * (1/2) *(1/2)
Therefore, the substance have decayed 4 times
One half=life = 1.25 million years
Four half-lives = 4 * 1.25 million years = 5 million years
Therefore, the age of the rock is 5 million years
Related Questions
● Hypothesis: Revise 1
To help your investigation, here is some more data about the farm.
How should I include my data?? Will give points and I picked natural selection
Answers
To write an inclusive hypothesis from investigation, it should be structured with Mechanism of Evolution, Hypothesis and Data.
How to hypothesize?Mechanism of Evolution
The mechanism of evolution that I think caused the increase in FQ resistance is natural selection. Natural selection is the process by which organisms that are better adapted to their environment are more likely to survive and reproduce. In this case, the bacteria that are resistant to FQ are more likely to survive and reproduce because they are not killed by the drug. This means that the population of bacteria will become more resistant to FQ over time.
Hypothesis
My hypothesis is that the increase in FQ resistance in the bacteria on the farm is due to natural selection. I believe that this is because the bacteria that are resistant to FQ are more likely to survive and reproduce, which means that the population of bacteria will become more resistant to FQ over time.
Data
The new data supports my hypothesis because it shows that the number of bacteria that are resistant to FQ has increased. The data also shows that the bacteria that are resistant to FQ are more likely to be found in the environment where the FQ is being used. This suggests that the bacteria are evolving to become resistant to the FQ.
How to Include the Data
You can include the data in your hypothesis by stating that the increase in FQ resistance is due to the fact that the bacteria that are resistant to FQ are more likely to survive and reproduce. You can also include the data by showing a graph of the number of bacteria that are resistant to FQ over time.
This is an example of how to include the data in the hypothesis:
I hypothesize that the increase in FQ resistance in the bacteria on the farm is due to natural selection. This is because the bacteria that are resistant to FQ are more likely to survive and reproduce, which means that the population of bacteria will become more resistant to FQ over time. The data supports this hypothesis because it shows that the number of bacteria that are resistant to FQ has increased. The data also shows that the bacteria that are resistant to FQ are more likely to be found in the environment where the FQ is being used. This suggests that the bacteria are evolving to become resistant to the FQ.
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More Channel proteins mean _____ permeable
A.more
B.less
Answers
Step by step solution you are aging not losing so I can’t be losing
Hope this helps tell me if I got it right or wrong
Respectively, what substances in dark greens and grains are tightly bound to iron and limit its absorption into the body?
Answers
Answer:
oxlic acid
Explanation:
I hope this help
which of the following are primary neural adaptations to anaerobic training?
Answers
The primary neural adaptations to anaerobic training include option (2) increased neural drive and reductions in inhibitory mechanisms.
The primary neural adaptations to anaerobic training include option 2) increased neural drive and reductions in inhibitory mechanisms. During anaerobic training, the nervous system undergoes changes to enhance muscle activation and force production.Increased neural drive refers to an improvement in the recruitment and synchronization of motor units, resulting in stronger and more coordinated muscle contractions. This adaptation allows for greater force generation during high-intensity activities.Simultaneously, anaerobic training can lead to reductions in inhibitory mechanisms, such as the activation of Golgi tendon organs, which limit muscle contraction force. The decreased inhibitory input allows for a greater activation of motor units and enables the muscles to generate higher levels of force.Options 1) decreased firing rates and alterations to selective recruitment, 3) decreased neuromuscular junction size and increased firing rates, and 4) lowered EMG at maximal force output and decreased reflex potentiation are not accurate representations of primary neural adaptations observed in anaerobic training.For more such questions on Anaerobic training :
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Question:
Which of the following are primary neural adaptations to anaerobic training?
1) decreased firing rates and alterations to selective recruitment
2) increased neural drive and reductions in inhibitory mechanisms
3) decreased neuromuscular junction size and increased firing rates
4) lowered EMG at maximal force output and decreased reflex potentiation
Which process in respiration happens last?
O A. Pyruvate processing
B. Krebs cycle
C. Glycolysis
O D. Electron transport chain
Answers
The process in respiration happens last is Electron transport chain. Thus, option D is correct.
What is transport chain?The transport chain has been known as an electrical and chemical continuum of four protein molecules that redox in the pairs, leading to the formation in the mechanism called oxidative phosphorylation, of ATP. It has been exists both in the mitochondrial and photosynthesis in mitochondria.
Glycolysis has a catabolic reaction that comprises of series of the steps that breaks down food to give off the energy in the form of ATP. Pyruvate has the product of glycolysis together with two ATP molecules. Pyruvate is further broken down by joining the krebs cycle.
Therefore, The electron transport chain that has been transfer electrons by using the redox reaction, to the reduce NADH to NAD + H and the FADH to FAD.
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Substances that can rust or
decompose are considered
A. ignitable
B. corrosive
C. radioactive
D. toxic
Answers
Answer:
B. corrosive
Hope this helps!
Substances that can rust or decompose are considered as corrosive.
How rusting takes place?
Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust
A corrosive substance is one that will damage or destroy other substances with which it comes into contact by means of a chemical reaction. it will cause rusting on iron substances.
Hence, the correct option is 'B'.
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Both osmosis and diffusion is the movement from Low concentration to
High concentrations.
O True
O False
Answers
Which type of tissue can send electrochemical signals?
A. Neuroglial cells in nerve tissue
B. Squamous cells in epithelial tissue
C. Neurons in nervous tissue
D. Goblet cells in epithelial tissue
Answers
The correct answer is C.Neurons in nervous tissue
they can generate and send electrochemical signals according to the distribution of ions on the two sides of the membrane
What devices are used by operators to block out scattered radiation?
A) Lead barriers/shields
B) Digital subtraction devices
C) Intensifying screens
D) Paralleling harrior
Answers
Answer:
A
Explanation:
What is the definition of thermogenesis? (1 point)
O living organisms make heat by lying in the sun
O living organisms make heat through metabolic activity (this one is correct)
O living organisms make energy through muscle contractions
O living organisms make energy through metabolic activity
Answers
Answer: living organisms make heat through metabolic activity.
Explanation:
12. Which of the following is NOT true of the respiratory system?
a. Takes in carbon dioxide and releases oxygen
b. Takes in oxygen and releases carbon dioxide
c. Involves the lungs
Answers
d. Contains brain activity The exchange of gases occurs inside the human body's respiratory system, which is a crucial mechanism. It absorbs oxygen and exhales carbon dioxide, and the opposite is also true.
The lungs are a part of the respiratory system and are in charge of the exchange of gases. However, the brain is not a part of the respiratory system. Although the respiratory system is one of the many bodily processes that the brain regulates, the lungs are where gases are actually exchanged.
Although the lungs are the organs that carry out the task of breathing, the brain provides instructions to them to govern it. As a result, the right response is d. Involves the brain.
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Which statement about active transport is most accurate? Active transport utilizes energy from ATP molecules. Active transport utilizes energy from ATP molecules. Active transport is essential to move water into and out of a cell. Active transport is essential to move water into and out of a cell. Active transport is the only way to move ions into and out of a cell. Active transport is the only way to move ions into and out of a cell. Active transport is required to move ions into and out of a cell. Active transport is required to move ions into and out of a cell.
Answers
Answer:
I feel like you just answered your own question but I'm going to help you out anyway, active transport utilizes energy from ATP molecules.
Explanation:
The most accurate statement about active transport is active transport utilizes energy from ATP molecules.
Transport active is a type of transport used by cells to move substances against a concentration gradient across cell membranes.Active transport Is mediated by different membrane proteins known as carrier proteins coupled to an energy source such as, for example, ATP.During this process (active transport), hydrolysis of ATP provides the energy required to move molecules/ions against a concentration gradient.In conclusion, the most accurate statement about active transport is active transport utilizes energy from ATP molecules.
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Which of the following is NOT an example of a stimulus and response?
A. Sweating when the body is hot
B. Shivering when the body is cold
C. Growing taller as you go through childhood
D.Squinting your eyes when you walk into a bright room
Answers
answer is C
hope that helps^^
In Ancient Chinese society, who was expected to
take care of the elderly at some point in their
lives?
Answers
Answer:
The youngest descendants of the elderly. Generally, the children or grandchildren of the elderly people would be expected to take care of the elderly once they were too old to work or take care of themselves.
The legal responsibility of adult children to provide support for their older parents has been a Chinese tradition for thousands of years. Because parents raise children, it is the children's responsibility to show their filial piety when their parents become elderly.
please answer fully.
A person cannot produce several types of proteases. Name the problem this specific person probably has and explain why.
Answers
Answer:
The person have excess amount of proteases and when this happen, the person will protein breakdown in the body or lack of protein in the body which can affect most of the organs in the body.
Explanation:
Under normal conditions in the body, blood and body tissues have a specific potent enzyme called proteases. Protease help in the breakdown of protein in the body and play important roles in defending or fight against incoming infections and inflammatory processes in the body .There is need for thslese proteases to be regulated or control because overactivity can lead to protein destruction which will lead damage of different body organs. In order to control this, blood and other tissues in the body posses enzymes with protease inhibitory activity, these enzymes help to prevent its from undergoing excessive action and potentially harmful effects.
The yellow box is pointing out the dashed line drawn on the S shaped graph. This line is called
Please help me ASAP
Answers
Answer:
Carrying capacity
Explanation:
The graph shows the growth of a population of yeast cells over time. The solid line shows that they go through an expontential growth phase (log phase) where they are growing very quickly before plateuing.
The graph shows that the solid line plateus at the height of the dotted line. The dotted represents the number of yeast cells at which the population reaches the maximum - the carrying capcity.
The carrying capacity of an environment is the maximum population that can be sustained in that environment due to size and resources.
extreme rarity' can be described as: group of answer choices restricted range, narrow habitat tolerances, and small local populations restricted range, broad habitat tolerances, and large local populations extensive range, narrow habitat tolerances, and large local populations restricted range, broad habitat tolerances, and small local populations extensive range, broad habitat tolerances, and small local populations
Answers
The correct option is A; Restricted range, narrow habitat tolerances, and small local populations ,
Net reproductive rate (r) is computed as r = (births-deaths)/population size, or simply multiply by 100. Because the population is so much larger, many more people are added.
The second type. A Type II survivorship curve can be found in many bird species. Organisms die more or less evenly at each age interval in a Type II curve. Organisms with this type of survivorship curve may also have a small number of offspring and require a lot of parental care.
A habitat is the broad location in which an organism lives, whereas a niche is the set of physical and biological conditions in which a species lives, as well as the means by which the species obtains what it requires to survive and reproduce.
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In an area of East Texas, the most intense competition would most likely occur between white-tailed deer and
A. brown bears
B. squirrels
C. other white-tailed deer
D. coyotes
Answers
Given what we know, we can confirm that the most intense competition would most likely occur between white-tailed deer and other white-tailed deer.
Why would white-tailed deer most likely compete with themselves?This has to do with food sources. Of the many animals listed, none of them share a food source with the white-tailed deer. The deer are herbivores that feed primarily on grass and shrubs. The bears and coyotes are carnivores that feed on other animals such as the deer themselves. While squirrels are herbivores but do not compete with the deer for food.
Therefore, given that other deer are the only animals listed that are after the same food source, we can confirm that the most intense competition would most likely occur between white-tailed deer and other white-tailed deer.
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Answer:
c
Explanation:
just took it
identify the parts of this food chain. the sun produces provides the energy for grass to grow. a grasshopper eats the grass. a bird swoops down and eats the grasshopper. a bobcat captures and eats the bird. mushrooms breakdown the bobcat when it dies.
Answers
The food chain consists of the following parts: sun, grass, grasshopper, bird, bobcat, and mushrooms.
The food chain begins with the sun, which provides the energy for the grass to carry out photosynthesis and grow. The grasshopper then feeds on the grass, obtaining energy and nutrients from it.
Next, a bird preys on the grasshopper, consuming it as a source of food. The bird, in turn, becomes the prey for a bobcat, which captures and consumes the bird to meet its energy needs.
The food chain does not end with the bobcat. When the bobcat dies, mushrooms come into play. Mushrooms are decomposers, which means they break down dead organic matter.
In this case, the mushrooms break down the remains of the bobcat, aiding in the process of decomposition. They help break down the organic materials and return nutrients back to the soil, completing the cycle.
Thus, the mushrooms play a crucial role in recycling the nutrients from the dead bobcat back into the ecosystem, sustaining the food chain and supporting the growth of other organisms.
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The element nitrogen is present in all of the following except A) proteins.B) nucleic acids.C) amino acids.D) DNA.E) monosaccharides.
Answers
Nitrogen is present in all of the options listed except for monosaccharides. Thus, correct option is (E).
A crucial component of biological compounds is nitrogen. Nitrogen is a component of proteins, nucleic acids (DNA and RNA), amino acids (which serve as the building blocks for proteins), and DNA. Amino acids, which make up proteins, contain nitrogen as a necessary part of their structure.
Adenine, cytosine, guanine, and thymine/uracil are nitrogenous bases that are essential for the operation of nucleic acids, including DNA. Monosaccharides, simple sugars and the fundamental unit of carbohydrates, do not, however, include nitrogen. Instead, the majority of their atoms are made up of carbon, hydrogen, and oxygen.
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what is the polypeptide component of lipoprotein called? what is the polypeptide component of lipoprotein called? prolipoprotein apolipoprotein prelipoprotein exolipoprotein
Answers
polypeptide component of lipoprotein is called Apolipoprotein
Apolipoprotein Apolipoprotein (Apo), a protein found in plasma lipoprotein, has the ability to bind and transport blood lipids to various human organs for utilisation and metabolism. The liver and small intestine both contribute to its primary site of synthesis. A collection of plasma proteins known as apolipoprotein is linked to a number of illnesses, including hyperlipidemia, atherosclerosis, Alzheimer's disease, and diabetes. Accurate identification and classification of apolipoproteins are important in order to study the function of apolipoproteins and create efficient targets for diseases associated with them. Biochemical investigations can accurately identify apolipoproteins, but they are expensive and time-consuming.To learn more about Apolipoprotein refer;
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Which of these would be true concerning mitochondria and nerve cells?
es )
A)
free-floating mitochondria in the blood plasma creates the energy needed
for the neurons
B)
mitochondria are not found in nerve cells as nerves use a different type of
energy than ATP to function
C)
all of the ATP for nerve cells is transported to from the mitochondria in
other cells directly to the nerve cells
due to the high energy demand of neurons, the mitochondria help produce
large amounts of ATP are needed for neurotransmission
D)
Answers
Answer: D just took the test
Explanation:
Answer:
D
Explanation:
Got it right
Why is spider not classified as an insect ?
Answers
Solution:
Both insects and arachnids are arthropods. However, in the morphology of an insect, there are 6 legs. While in the morphology of an arachnid there are 8 legs. Also, arachnids do not have antennae, their head is not differentiated from the body but is typically divided into two main regions called the cephalothorax (prosoma) and the abdomen (opisthosoma). Spiders belong to the arachnids, therefore a spider is different from an insect. Therefore, a spider cannot be classified as an insect.
A student designs and experiment to test the effect of different fertilizers on plant growth. Which of the following is the independent variable?
Answers
Answer:
Fertilizer
Explanation:
Independent variable = a variable that does not depend on another
Since the plant growth depends on the fertilizers, we can note that plants are the dependent variable.
The fertilizer is independent since it does not depend on anything.
Plant seedlings were treated with a range of concentrations of coumarin, a small organic compound. After one week, seedling height was taken as a measure of plant growth. In a separate experiment, stem tissue sections were taken from newly germinated seedlings and incubated in solutions containing 14C-glucose and coumarin. After 24 hours, the quantity of radioactive label in cytoplasmic and cell wall fractions was measured. All data are shown in the table above. Which statement is supported by these results
Answers
Coumarin is found to restrict the production of a specific component found in the cell walls but not in the cytoplasm, which plays an important role in the growth of the stem. (BIOSYNTHESIS< CYTO< STEM GROWTH)
The results from the experiment suggest that coumarin treatment negatively impacts the growth of plant seedlings, as measured by seedling height. This indicates that coumarin has an inhibitory effect on stem growth.
Additionally, the experiment that measured the number of radioactive labels in cytoplasmic and cell wall fractions revealed that coumarin affects the biosynthesis of a specific component in the cell walls but not in the cytoplasm. This suggests that coumarin specifically targets the production of a component that is critical for stem growth, and that this component is found primarily in the cell walls and not in the cytoplasm.
This is further supported by the fact that the radioactive label is found in the cell wall but not in the cytoplasm, indicating that the biosynthesis of this component is taking place in the cell wall and not in the cytoplasm. Overall, these results suggest that coumarin is inhibiting the biosynthesis of a component that is critical for stem growth, specifically in the cell walls.
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Which is not a product of combustion?
O Energy
Thing
O H20
O O₂
O CO2
Answers
Answer:
H20 is not a product of combustion
in the collection of data, list at least 3 important constants
Answers
The person who will collect the data, the environment in which the data will be collected, and the element who will provide the data. Hope this helped!
Help me anyone, please !!!!
Answers
When a person needs transfusion, the link on compatibility (option A) is most apt.
What is genotype?The genotype of an individual is the number of genes that the individual possess.
Using the Mendel crossing, we can see that if the parents are AB and AO one offspring will have type A blood.
If we look at the chart, we can see that the blood type A and B are both codominant and are dominant over O hence option K is correct.
When a person needs transfusion, the link on compatibility (option A) is most apt.
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How can ultrasound check for cracks in metal?
Answers
Answer:
The newly developed SONOSCAN angle probes of SONOTEC for non-destructive material testing check metals for cracks and inclusions. They are mainly used in the metal industry. The ultrasonic probes are able to detect critical defects as well as quality deficiencies of welds.
Explanation:
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Answer:Computers are able to create detailed images by combining many ultrasound reflection readings
Explanation:
how an atom change if all of its electrons are removed
Answers
Answer:
If all the electrons of an atom are removed, it will change to become a positively charged ion called a cation. Additionally, the loss of all of its electrons means there is no negative charge to balance the positive charges of the protons.
Explanation: