Answer:
Explanation:
Using the concept of de Broglie wavelength under relativistic conditions to determine the spatial limits for electron range.
de Broglie wave-length [tex]\lambda = \dfrac{h}{p}[/tex]
where;
h = plank's constant
p = momentum of particle which is expressed as:
[tex]p = \dfrac{\sqrt{k^2+2kmc^2}}{c}[/tex]
replacing the expression for (p) into [tex]\lambda = \dfrac{h}{p}[/tex], we have:
[tex]\lambda = \dfrac{h}{\dfrac{\sqrt{k^2 +2kmc^2}}{c}}[/tex]
[tex]\lambda = \dfrac{hc}{\sqrt{k^2+2kmc^2}} --- (1)[/tex]
here;
c = velocity of light = 3 × 10⁸ m/s
h = 4.13 × 10⁻¹⁵ eV.s
i.e.
hc = (4.13 × 10⁻¹⁵ eV.s)(3 × 10⁸ m/s)
hc = 1240 eV.m
The electron's rest energy (mc²) = 0.511 × 10⁶ eV
For the elctrons;
the minimum accelerated voltage = 40kV
the maximum accelerated voltage = 100 kV
the minimum K.E of the electron K = eΔV
K = e × 40 kV
K = 40 KeV
K = 40 × 10³ eV
From equation (1);
[tex]\lambda = \dfrac{hc}{\sqrt{k^2 +2kmc^2}}[/tex]
[tex]\lambda = \dfrac{1240 \ eV.nm}{\sqrt{(40 \times 10^3 \ eV)^2 +2(40 \times 10^3 \ eV)(0.511 \times 10^6 \ eV})}[/tex]
[tex]\lambda = \dfrac{1240 \ eV.nm}{\sqrt{((1600000000) +(80000\times 511000))eV}}[/tex]
[tex]\lambda = \dfrac{1240 \ eV.nm}{\sqrt{((1600000000) +(40880000000)eV}}[/tex]
[tex]\lambda = \dfrac{1240 \ eV.nm}{\sqrt{(42480000000) \ eV}}[/tex]
[tex]\lambda = \dfrac{1240 \ eV.nm}{206106.769 \ eV}}[/tex]
[tex]\lambda = 0.062 \ nm[/tex]
[tex]\mathbf{\lambda = 6.20 \ pm}[/tex]
The maximum K.E of the electron K = eΔV
K = e × 10 kV
K = 10 KeV
K = 100 × 10³ eV
From equation (1);
[tex]\lambda = \dfrac{hc}{\sqrt{k^2 +2kmc^2}}[/tex]
[tex]\lambda = \dfrac{1240 \ eV.nm}{\sqrt{(100 \times 10^3 \ eV)^2 +2(100 \times 10^3 \ eV)(0.511 \times 10^6 \ eV})}[/tex]
[tex]\lambda = 0.037 \ nm[/tex]
[tex]\mathbf{\lambda = 3.70 \ pm}[/tex]
As a result, the spatial limits for the electron's range span from 6.02 pm to 3.70 pm.
Who do we balance a chemical equation
Answer:
We have to balance chemical equations because you need to satisfy the law of conservation of matter. That states that matter cannot be produced or destroyed in a closed system. The law of conservation of mass governs the balancing of a chemical equation.
Answer:
I think you meant how?
Explanation:
but always you balance a chemical equation by looking at how many atoms you have for each element. For example we have the chemical equation Na + Cl2----> NaCl
so there's 1 Na atom
there's 2 Cl atoms
and for the product side
there's 1 Na atom
there's 1 Cl atom
TO BALANCE THIS you have to make the reactants side equals the product side by ADDING COEFFICIENTS.
so it would be 2Na + Cl2 ---> 2NaCl
Select all that apply.
Characteristics of meiosis include_____.
1) The most common kind of cell division
2) Four daughter cells produced when parent cells divide
3) same number of chromosomes in each daughter cell as in a parent cell
4) different DNA in the daughter cell than in the parent cell
how does the kidney help with excretion
Answer:
kidneys filter about a half cup of blood every minute, removing wastes and extra water to make urine
Label each example below as one of the following types of energy: chemical, thermal, sound, electrical, gravitational, nuclear, radiant, or mechanical.
(40 pts + brainliest)
Answer:
Explanation:
lighting strike:sound
stretched rubber band:mechanical
battery: electrical
nucleus of an atom: chemical
light: radiant
phone:sound
How can unicellular organism be classified as an eukaryotic cell?
Answer:
Answer is A
Explanation:
Unicellular eukaryotes are single-celled micro-organisms with a defined nucleus, mitochondria and other organelles. They include phytoplankton, or algae, and zooplankton, or protozoa. Unicellular eukaryotes originated billions of years ago.
is meiosis similar to mitosis true or false
Answer: Meiosis and mitosis are both cell division cycles that result in daughter cells. Meiosis occurs in the gametes, while mitosis occurs in all non-gamete cells. Meiosis also results in two cell division rounds, whereas mitosis only has one cell division round.
Gene regulation is a section of the DNA that contains the genes for the proteins needed for a
specific metabolic pathway.
A True
B False
Answer:
The correct answer is - B. false.
Explanation:
A section or segment of the DNA that contains the genes for the proteins needed for a specific metabolic pathway is called an operon. Gene regulation on other hand is the process of an organism to control which genes are transcribed.
Gene regulation is the ability of turning the genes on or off for transcription. It is regulated by various ways such as chemically modifying genes and using regulatory proteins.
PLS I WILL GIVE BRAINLIEST HELP PLS BY 915pt please thanks
Answer:
B
Explanation:
It can power the car the whole time
Which of the following is a concern if you forgot to resuspend (mix) culture solutions when performing serial dilution?
A) Bacteria would no longer be able to grow on solid media
B) CFU/mL calculations would not be accurate
C) Colony morphology would be disrupte
D) The pure culture would be contaminated
Answer:
B) CFU/mL calculations would not be accurate
Explanation:
In microbiology CFU is the acronym for Colony Forming Unit, which indicates the number of bacteria or fungi capable of multiplying under suitable conditions. In this case, CFU/mL indicates how much bacterial or fungal cells, susceptible to reproduction, exist within 1 mL of a culture solution.
When this solution is used, to make a dilution or other laboratory activity, it is important that it be resuspended, that is, mixed, as the bacteria or fungus cells can accumulate in the bottom or surface of the substance, changing the value of CFU/mL and causing inaccurate dilutions if used. When resuspended, the substance presents the appropriate value of CFU/mL, ensuring that the dilution is accurate and effective.
Which of the following is FALSE regarding blood glucose?
It provides energy to cells
It is used to make proteins
It is found in simple carbohydrates
It travels through bloodstream
Answer:
glucose is a sugar, therefore cannot make proteins
Explanation:
A population age structure in which the birthrate is high A population age structure in which the birth rate is high and the population is mainly young would be best
represented by a graph with a/an -shaped curve.
O bell
O urn
O pyramid
O S
O J
Answer:
pyrimid
Explanation:
Let's start with a ham and cheese sandwich with lettuce and pickles. As I bite into my sandwich the teeth are present for mastication to begin the process of mechanical digestion and the saliva begins to mix with my food where salivary amylase is present and starts the digestion of the starchy bread. What happens next? (Think about the carbohydrates, proteins and fat in our sandwich
Answer:
Explanation:
After amylase act on carbohydrates, the chyme pass through the oesophagus down to the dudoneum in the small intestine. Amylase also continue to break it down into disacharrides and enzymes like maltase, sucrase and lactase are released to further break it down into maltose, sucrose, and lactose then finally glucose, a way it can be absorbed easily by the epithelial walls.
The digestion of lipids and protein begin in the dudoneum of small intestine.
Trypsin act on protein and break it down to peptides. Peptidase is then released and break it to single chain peptides bond. In the small intestine, dipeptidases break it down into amino acids easily absorbed by the epithelial walls.
The bile in the gall bladder produce enzyme called lipases which breakdown lipids and make it to undergo emulsification.
Which of these describes one way the nervous system and the circulatory system interact to maintain homeostasis?
A.
The blood's glucose level increases after eating.
B.
The brain stimulates sweating in hot weather.
C.
The kidneys conserve water and filter out acidic properties of food.
D.
The hypothalamus senses properties of the blood such as electrolyte level.
Answer:
Mañana tengo escuela y son las 3 de la mañana
Explanation:
weno me esperas 29 minutos para poder traducir lo que dice ahí? es que no entendí.
Two normal parents produce a child affected with the autosomal recessive disease homocysteinuria. They want to have 3 more children. You tell them the chance of 1 OR MORE affected among the next three children is:
Answer:
Zero
Explanation:
Because in a situation whereby both parents are carriers of an autosomal recessive condition there is a 1 in 4 chance of them having an affected child.
Hence, given that these two normal parents have already had one affected child with the autosomal recessive disease homocystinuria. There is ZERO chance of having an affected child in the next three kids they will be having.
who is the fathers of plants cell
Answer:
explain? are you looking for the male parts of a cell
Small, reduced leaves with a single vein occurring in the club mosses
Answer:Club mosses are low evergreen herbs with needlelike or scalelike leaves. Many species have conelike clusters of small leaves (strobili), each with a kidney-shaped spore capsule at its base. The plants are homosporous, meaning they produce just one kind of spore
Explanation:Although they lack true veins, many species of mosses have long narrow cells in their stems, the midribs of their leaves, and their rhizoids (root-like plant tissue) that can be considered evolutionary precursors to true veins. Vascular plants with true veins include the clubmosses, ferns, and flowering plants.
What category of sensor is a first responder likely to use to determine the oxygen level in a victim's blood?
Answer:
Biometric sensor
Why is drip irrigation excellent for places like Dubai ?
pls answer!!
Answer:
Due to water scarcity in Rajasthan, it is very difficult to take up irrigation facilities very fast. So drip irrigation method allows water to drip slowly to the roots onto the soil surface. The water reaches the base of the plant due to its very rocky surface. It is done through a network of pipes, valves.
Next they evaluated the prediction using a specific experimental procedure they collected experimental data by catching mice from the beach and releasing them inland. And by catching mice from inland releasing them on the beach.
a. True
b. False
trueeeeeeeeeeeeeeeeeeeeeeeeeee
The compression sleeve would increase the interstitial fluid hydrostatic pressure and would decrease the amount of fluid leaking from the capillaries in the right arm.
a. True
b. False
During the drought of 1977 on the island of Daphne Major, which of the following answers correctly explains why birds with
larger beaks had a competitive advantage over other individuals?
A) These birds were able to fight off birds with smaller beaks more successfully
B) Birds with larger beaks were better able to utilize the large seeds.
C) These birds were able to smell and locate nesting sites with more accuracy
D) These birds were able to hold more water.
Answer:
1. Birds with larger beaks were better able to utilize the large seeds.
2. DNA analysis shows that their DNA is almost identical...
3. The diversity in environments on each island provides...
4. The utilization of different resources requires different...
5. Scientists observe the frequency of the different forms...
Explanation:
100% hopefully this helps someone out ♡
Competitive Advantage Quick Check
Birds with larger beaks being better able to utilize the large seeds correctly
explains why birds with larger beaks had a competitive advantage over
others.
During the drought, there was as scarcity of food and resources and the
birds which have larger beaks has an advantage over other types. This was
as a result of their ability to find food in more areas.
Birds with long beak were able to crack seeds which were large and stronger in size which give them the advantage over others.
Read more on https://brainly.com/question/11949149
What is the probability of producing a child that will phenotypically resemble either one of the two parents in the following four cases? How many phenotypically different kinds of progeny could potentially result from each of the crosses? Aa Bb Cc Dd X aa bb cc dd
Complete question:
What is the probability of producing a child that will phenotypically resemble either one of the two parents in the following four cases? How many phenotypically different kinds of progeny could potentially result from each of the crosses?
a. Aa Bb Cc Dd × aa bb cc dd
b. aa bb cc dd × AA BB CC DD
c. Aa Bb Cc Dd × Aa Bb Cc Dd
d. aa bb cc dd × aa bb cc dd
Answer:
a) the probability of producing a child that will phenotypically resemble either one of the two parents is 1/8.
There will be 16 possible phenotypes among the progeny
b) the probability of producing a child that will phenotypically resemble either one of the two parents is 1.
There will be one possible phenotype among the progeny
c) the probability of producing a child that will phenotypically resemble either one of the two parents is 81/256 = 0.316.
There will be 16 possible phenotypes among the progeny
d) the probability of producing a child that will phenotypically resemble either one of the two parents is 1.
There will be one possible phenotype among the progeny
Explanation:
Due to technical problems, you will find the complete explanation in the attached files
What happens to the equilibrium when sodium hydroxide is added to ammonia
Answer: you add Sodium Hydroxide you will cause Equilibrium to shift to the left. The effect will be to force NH3 out of the solution and back to gas form
Which of the following junctions binds a cell to another cell and is linked to keratin intermediate filaments?
a. desmosome
b. tight junction
c. adherens junction
d. hemidesmosome
list 3 thing that you dont like
The same nutrient is one of the
slowest moving nutrients and is
often the limiting nutrient in
aquatic ecosystems. What is this
nutrient?
A. carbon
B. nitrogen
C. phosphorus
The answer is c
Phosphorus is often the limiting nutrient, or nutrient that is most scarce and thus limits growth, in aquatic ecosystems.
Hope it helps
how can an irreverible step in a metabolic pathway be reversed?
A. When both the reactants and products have equal amounts of energy
B. When the reactants contain large amounts of energy
C. When another chemical reaction with a large amount of energy occurs at same time
D. when collision of substances generate the energy needed
how can an irreverible step in a metabolic pathway be reversed?
A. When both the reactants and products have equal amounts of energy
B. When the reactants contain large amounts of energy
C. When another chemical reaction with a large amount of energy occurs at same time
D. when collision of substances generate the energy needed
Order the sequence of events in transcription?
1- free ribonuleotide triphosphates base-pair with the deoxyribonucleotides in the DNA template
2- RNA polymerase binds to the promoter region of a gene
3- primary rna transcript is formed
4- two DNA strands are seperated
Which organic molecule is not found on the plasma membrane?
A. carbohydrates
B. cholestrol
c. phospholipids
d. proteins
What does this statement mean : "Information flow between cells tissues and organs is an essential feature of homeostasis and allows for integration of physiological processes"
A. the nervous system is the most prominent body system for integration of physilogical processes
B. some substances can affect local processes while others travel to exert their effects on other distant parts of the body
C. communication between body structures through body fluids is the most important physiological processes
D. Neurotransmitters, hormones, paracrine and autocrine substances exert their efferts locally as well as distant body structures
which statement best describes the orientation the phospholipid molecules in a membrane:
A.) the nonpolar fatty acids are oriented towards the cholestrol molecules
B.) the hydrophilic layer is oriented towards the middle of the phosphlipids
C.) phospholipids align themselves in the membrane in a bimolecular layer
D.) the hydrophobic and hydrophilic structures point away from the cell
Which is NOT a product of glycolysis under aerobic and anaerobic conditions?
A.) lactate
B.) FADH
C.) pyruvate
D.) NADH
Which reason is why water is an essential nutrient?
A.) water needs to move between compartments
B.)can be obtained through ingestion
C.) body cant make enough water for its needs
D.) water evaporates from the skin that has the largest surface area among all body structures
Answer:
WEEEE pero tu crees que yo voy a traducir todo eso?
Explanation:
me da flojera y aparte tengo que estudiar.
This process of Earth takes about 365 days to complete,
O convection
O conduction
O rotation
revolution
HELPPPPPP PLEASEEEEE ILL GIVE BRAINLIEST AND POINTSSSS
(you dont need to answer them both but at least help me with one)
Why has the Ugandan government pushed Abstinence as a means of combating the spread of HIV/AIDS?
On a separate piece of paper, construct a population pyramid to illustrate the current age groups infected by HIV/AIDS in Uganda.
1. A reexamination of HIV seroconversion studies suggests that condoms are 90 to 95% effective when used consistently, i.e. consistent condom users are 10 to 20 times less likely to become infected when exposed to the virus than are inconsistent or non-users.
The main reason why has the Ugandan government pushed Abstinence as a means of combating the spread of HIV/AIDS is: the people for whom the propaganda is done are mostly children above 10, who tend to start having sx at an early age.
Why has the Ugandan government pushed Abstinence as a means of combating the spread of HIV/AIDS?The ABC strategy is credited for bringing the HIV/AIDS epidemic under control in Uganda. By promoting abstinence, being faithful, and condom use, safe(r) behaviours have been identified that are applicable to people in different circumstances. Because the people for whom the propaganda is done are mostly children above 10, who tend to start having sx at an early age.
Thus, this could be the answer.
To learn more about the Ugandan government click here:
https://brainly.com/question/13319233
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how was the state of the ecosystem before the wolves were introduced?
hi !
Explanation:
when wolves were reintroduced , the research has shown that in many places they have helped revitalize and restore ecosystems. They improved the habitat and increase populations of countless species from birds of prey to pronghorn, and even trout.