quantity of the substance remaining = initial quantity of the substance * (.5)^(time elapsed/half life of the substance)
2.50 = 20 * (.5)^(19.2/x)
The half-life period of the given sample of the radioisotope is equal to 6.41 hours.
What is the half-life period?The half-life of a radioactive substance is defined as the time that is required to reduce the original quantity of a radioactive element to half after decay.
Half-life of a radioactive element is the characteristic of the element and does not depend upon the initial amount of the radioactive substance.
Given, the original amount of the radioisotope, N₀ = 20.0 g
The remaining amount of the radioisotope, N = 2.50 g
The time for which decay occurs, t = 19.2 hours
Consider that k is the rate constant of the decay of radioisotope,
[tex]k =\frac{2.303}{t} \times log \frac{N_0}{N}[/tex]
[tex]k =\frac{2.303}{19.2} log \frac{20}{2.50}[/tex]
k = 0.108 hr⁻¹
The half-life time of radioisotope can be calculated from the below mentioned formula:
[tex]t_{\frac{1}{2}} =\frac{0.693}{k}[/tex]
[tex]t_{\frac{1}{2}} =\frac{0.693}{0.108}[/tex]
[tex]t_{\frac{1}{2}} =6.41 hrs[/tex]
Therefore, the half-life period of the given sample of the radioisotope will be to 6.41 hours.
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How does the body structure evolve for animals as they transmit between the two environments?
Answer:
Biologists believe that new species evolve from existing species by a process called natural selection. ... Organisms that inherit that favorable new gene are likely to become more abundant than others of the species. Sometimes the population of a species becomes separated into two areas, by geography or by climate.
Explanation:
3. (a)
Explain why sweat accumulates on a person's skin in a hot humid
Environment
Answer:
In humid conditions where surrounding air cannot hold further water vapour, sweat evaporates slowly, if at all. As a result the body heats up. it is difficult for the sweat to evaporate and in high humidity conditions we tend to sweat more. This explains why it feels so much hotter in high humidity.
Which description accurately describes the cell membrane?
a. a single permeable layer of phospholipids that have hydrophobic heads and hydrophilic tails
b. a semi-permeable double layer of phospholipids that have hydrophilic heads and hydrophobic tails
c. a single permeable layer of phospholipids that have hydrophilic heads and hydrophobic tails
d. a semi-permeable double layer of phospholipids that have hydrophobic heads and hydrophilic tails
e. a barrier of polypeptides that prevents molecules from entering or leaving the cell
Answer:
b. a semi-permeable double layer of phospholipids that have hydrophilic heads and hydrophobic tails
Explanation:
B is correct as the cell membrane is selectively semi-permeable. It is selectively semi-permeable because this quality allows it to control what can and can't enter the cell, and how it does so.
The cell membrane also has a phospholipid bi-layer comprised of a double layer of phospholipids which have hydrophilic head and hydrophobic tails. This is because the heads are made of phosphate and are polar and are therefore attracted to water (hydrophilic), while the tails are made of lipids (i.e. fats, oils) which do not mix with water and are therefore hydrophobic.
The properties of each phospholipid is also why they form the double layer structure, the hydrophilic heads naturally face outwards into the water and protect the hydrophobic tails on the inside.
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2. When an object gets warmer it is:
a. loosing energy
b. keeping the same energy
c. gaining energy
Choose one correct answer.''
What is the relationship between DNA, a gene, and a chromosome?
A. A chromosome contains hundreds of genes, which are composed of DNA
B. A chromosome contains hundreds of genes, which are composed of protein
C. A gene contains hundreds of chromosomes, which are composed of protein
D. A gene contains hundreds of chromosomes, which are composed of DNA
Answer:
A
Explanation:
The correct option is (a). Chromosomes are long thread-like structures present in the nucleus of a cell which contains hereditary information of the cell (genes). Genes are the part of a chromosome and made up of DNA.
Answer:
A
Explanation:
chromosomes contain genes and Gene's are made of dna.
So, if life started aquatic how did it evolve for land and why?
Answer:
So when the first animals moved onto land, they had to trade their fins for limbs, and their gills for lungs, the better to adapt to their new terrestrial environment
Explanation:
Answer:
abilites
Explanation:
Organisms that use energy to control their internal conditions are
Answer:
regulators
Explanation:
regulators use their metabolism to control their internal environment
What are the main features of tropical climate
Its characteristic is the high temperature and the division of two seasons: rainy in summer and dry in winter. In regions affected by this type of climate, it is not possible to notice the change of seasons.
What will the result be if a purebred tall pea plant is mixed with a purebred short pea
plant?
А) A short pea plant, due to chance
B) A short pea plant, because short is the dominant allele
C) A tall pea plant, because tall is the dominant allele
VONEN
D) A tall pea plant, due to chance
Answer:
C
Explanation:
Answer:
C) A tall pea plant, because tall is the dominant allele
why animals need to move quickly
Answer:
Animals move for a variety of reasons, such as to find food, a mate, a suitable microhabitat, or to escape predators. For many animals, the ability to move is essential for survival and, as a result, natural selection has shaped the locomotion methods and mechanisms used by moving organisms.
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Since we can't drink ocean water due to its salt content, why is polluting the oceans so much a concem for people? Write your response in the essay box below.
answer:
we can't pollute water because there are creatures and organisims that live in the water so if we pollute it then they will die, besides you can filter the water to get rid of salt then you're able to drink the water and also use it for many other purposes.
Among Delta-back stripped fish, there are two genes that segregate independently of one another. Suppose the alleles at the first locus are A (dominant) and a (recessive) and the alleles at the second locus are B (dominant) and b recessive). If an AABB fish mates with an aabb fish, and their offspring are inter-crossed, the proportion of F2 fish that show a recessive phenotype at the first locus and a dominant phenotype at the second is:
Answer:
4/16
Explanation:
It is given that the alleles of the first locus = A dominant and recessive a
The allele of the second locus = B dominant and the recessive b.
Now if fish with AABB mates with the aabb fishes, then to tell the proportion of the F2 fish which shows either the dominant phenotype at the [tex]$\text{first locus}$[/tex] and also a recessive phenotype at the [tex]$\text{second locus}$[/tex].
So for this, the recessive phenotype at the [tex]$\text{first locus}$[/tex] as well as the recessive phenotype at the [tex]$\text{second locus}$[/tex] is in the ratio of 4/16.
The rind (skin) colors and patterns of watermelon fruit have been among the major objectives of breeding. If you cross a dark green watermelon with a grey watermelon, then let the F1 generation freely mate you get dark green, medium green, and grey fruits. Explain the inheritance of rind color in these plants
Answer:
Explanation:
l
What process releases
the phosphate minerals?
Answer: weathering
Explanation:
2. What nutrients do you need to stay alive? How do you obtain them?
Answer:
Explanation:Plants and other autotrophs absorb nutrients from soil and water. Autotrophs are organisms that can make their own food. The most important nutrients they need are carbon, hydrogen, and oxygen. Other nutrients needed by plants are nitrogen, phosphorous, potassium, calcium, magnesium, and sulfur.
Answer:
Protein, Carbs, Fats, Vitamins, Minerals, Water
Explanation:
Protein is gained from meat (occasionally)
Water is self explanatory
Minerals can be gained from eating, drinking, and anything really
Fats are gained from foods with fat (obviously) and juicy foods like steak.
Vitamins are gained from eating certain things like an orange or even from the sun.
Carbs can be gained from food such as bread, beans, spaghetti..
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What percentage of the offspring are going to be golden ?
Answer:
what's the complete question?
Answer:
yeah great question.
Explanation:
Describe why certain traits increase in frequency in a population. Provide ONE example to support your response.
Answer:
When a phenotype produced by certain alleles helps organisms survive and reproduce better than their peers, natural selection can increase the frequency of the helpful alleles from one generation to the next – that is, it can cause microevolution.
Explanation:
Because of having dominant traits certain traits increase in frequency in a population because they have.
What are traits?A phenotypic trait is a specific variant of an organism's observable characteristics. Phenotype refers to any measurable, observable and obvious characteristics of an organism. It can be either hereditary or environmental, but usually occurs as a collection of both.
When any allele tends to determine the phenotype, when passed from parent to child, it called as dominant allele. In case of homzygosity as well as heterozygosity, dominant allele can express itself.
Recessive in contrast is, when genotype is homozygous, the trait expressed is referred to as recessive trait. Therefore, certain traits increase in frequency in a population.
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Which list is the theorized correct order of living cells, starting with the first
organisms and going to the most recent?
anaerobic prokaryotes, unicellular eukaryotes, unicellular photosynthetic
prokaryotes, multicellular eukaryotes
multicellular eukaryotes, anaerobic prokaryotes, unicellular photosynthetic
prokaryotes, unicellular eukaryotes
anaerobic prokaryotes, unicellular photosynthetic prokaryotes unicellular
eukaryotes, multicellular eukaryotes
multicellular eukaryotes, photosynthetic prokaryotes unicellular eukaryotes,
anaerobic prokaryotes
Evolution occurs from simple to complex organisms i.e from anaerobic prokaryotes, unicellular photosynthetic prokaryotes unicellular eukaryotes, multicellular eukaryotes. Correct answer is option (c).
What is cell theory ?According to the cell theory,
Cells make up every living thing. They can be either unicellular or multicellular in nature.The simplest form of life is the cell.Existing cells give rise to new ones. They are not the result of spontaneous generation.Eukaryotes are thought to have developed from prokaryotes approximately 2.7 billion years ago. The main difference between these two types of creatures is that eukaryotic cells have a membrane-bound nucleus, whereas prokaryotic cells have not.
Therefore, option (C) is correct because prokaryotes are the simplest cellular organism while eukaryotes are complex multicellular.
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Strawberry poison dart frogs have different skin colors within their population. The frogs can be categorized broadly using the colors green, blue, yellow, and red. A
researcher performs an experiment using colored clay frogs to represent the different types of frogs to investigate which color morph is preyed upon the most by
snakes. The researcher compares the number of snake attacks on each of the four different colored clay frogs.
200-
150-
Number of Attacks
100
50-
0
green
Blue yellow red
Color of Clay Frogs
Which distribution of strawberry poison dart frogs is likely to exist in nature?
There will be more red-colored frogs in the population than green-colored frogs.
There will be more yellow colored frogs in the population than red-colored frogs
There will be more green colored frogs in the population than yellow-colored frogs.
There will be more blue colored frogs in the population than yellow-colored frogs.
Answer:
There will be more yellow-colored frogs in the population than red-colored frogs
Explanation:
Available data:
Strawberry poison dart frogs have different skin colorsThe frogs can be categorized broadly using the colors green, blue, yellow, and red.Frogs eaten by snakesNumber of snake attacks Frog color
145 Approx Green
180 Approx Blue
125 Approx Yellow
145 Approx Red
The phenotype of individuals and the environment where they live, interact and determines the genes´ destiny in space and time. The result of this interaction and the gene destiny is Natural Selection. Natural selection selects beneficial alleles and increases their frequency in the population.
The attack by snakes is acting as a selective pressure on the frogs´ population. It is an ecological pressure that is modeling the frogs´ phenotype.
Animals that suffer more attacks are the blue ones, followed by green and red frogs. Those that suffer the fewest number of attacks are the yellow individuals.
So natural selection will be acting on this population favoring the alleles that code for yellow color. Genes that express yellow color increase more the frogs´ fitness than genes that code for the other colors. So natural selection increases the frequency of genes coding for yellow color and will decrease the frequency of the other alleles. Probably the less favored will be genes that express blue.
Which of the following are the principal divisions of the solid Earth ?
Answer:
Hey mate.....
Explanation:
This is ur answer.....
Earth is actually composed of three major parts or layers: the solid earth (which includes the parts near or at the surface, the asthenosphere and lithosphere), the atmosphere (the blanket of air that envelopes the earth), and the hydrosphere (the water parts, including ocean, streams and air moisture).
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This paramecium has a nucleus and is comprised of one cell. Which terms best describe this organism?
Answer: The term that best describes this organism is that it's a UNICELLULAR PROTISTA.
Explanation:
Unicellular organisms are that are made up of just one cell. They are also called single- celled organisms. Examples of unicellular organisms include: Amoeba, chlamydomonas and paramecium.
The paramecium is a protist which is SINGLE-CELLED and is made up of eucaryotic cells in which the cell structure is complex with a well-defined NUCLEUS.
The structure of this organism helps it to survive in its environment. It has cilia that helps it move food into its gullet.
The food vacuole circulate along a definite path in the cytoplasm. The anterior and posterior contractile vacuole, with radiating channels draining into them, helps to get rid of excess water from the body. The food vacuoles circulate along a definite path in the cytoplasm. The anterior and posterior contractile vacuole, with radiating channels draining into them, helps to get rid of excess water from the body.
The NUCLEUS is used by the organism for sexual reproduction. This occurs in a process known as conjugation whereby the whole organism pair with another similar whole organism and exchange their nuclei.
What should be done with a used needle??
Answer:
It should be disposed of because its dirty and no one wants a disease from it if it goes into you somehow
Explanation:
Question 3 What is a characteristic of consumers?
Psychographic characteristics of consumers include interests, activities, opinions, values and attitudes.A company may better understand consumer opinions and attitudes after conducting a focus group, and can use that information to tailor advertising or marketing campaigns.
Explanation:
Pls help asap which property of water is the most direct cause within the ? ) Water is a versatile solvent Water is a polar molecule Water a high heat capacity Water has a high surface tension
Answer:
A.
Explanation:
Which Texas ecoregion described below was formed due to weathering and erosion? A Edwards Plateau - home to rare organism that live in canyons B. Piney Woods - high density of vegetation, pines, oaks, and croplands with nutrient rich soil CC Crosstimbers - high concentration of trees, plains and parries with soil that drains water easily D Post Oak Savannah - transitional area of plant life ranging from grasslands to forests with fertile soll can yi
Answer:
d
Explanation:
because
Mitosis creates...
A) 4 identical cells
B) 2 identical cells
C) 4 unidentical cells
D) 2 unidentical cells
Answer:
B) 2 identical cells
Explanation:
"Mitosis is a type of cell division which produces two identical diploid daughter cells. "
the word root that means lung is
Answer:
I think is Pulmonarycorrect me if I'm wrong
PLEASE HELP!!!!!!
The process that produces 2 genetically different cells is
A) mitosis
B) mitosis and meiosis
C) meiosis II
D) meiosis I
Answer:
b
Explanation:
Meiosis has both similarities to and differences from mitosis, which is a cell division process in which a parent cell produces two identical daughter cells. Meiosis begins following one round of DNA replication in cells in the male or female sex organs.
What would be the best source of information for an essay about sharks?
A) An outdoor magazine
B)A web-based encyclopedia
C)The top hit on a "sharks" web search
D) An educational television program
Answer:
D
Explanation:
The other sources aren't trusted
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Renewable Energy is the best solution to Coal, Petroleum, Nat Gas, and Nuclear
True or false
Explanation:
coal , petroleum,Net Gas , Nuclear are the non renewable source of energy .
so
False is the answer of your question