Answer:
b is constant
Explanation:
The half-life of a radioisotope is constant throughout its life cycle.
Half-life is the time taken for half of the radioactive nuclei to disintegrate.
Every radionuclide has its characteristic half-life and it is independent of the number of radioactive atoms.
The half-life does not depend on any variable. It is an inherent property of a radioactive isotope. The shorter the half-life, the faster a radionuclide decays. Nuclides with a long half life are fairly stable for a long period of time. The decay of a radioactive element is usually characterized by its half-life.Therefore, the most ideal statement about half-life is that it is constant.
What was the time frame?
500 Million Years Ago
900 Million Years Ago
650 Million Years Ago
4.6 to 4 Billion Years Ago
Answer:
If you are referring to the Precambrian time, the answer is 500 Million Years Ago.
Explanation:
Precambrian time is the time period that started with the formation of Earth and ended about 500 million years ago.
4. Which of the following
is an example of a
heterogeneous mixture?
a, tea
b. oxygen
c. pizza
d. water
Answer:
water
Explanation:
Answer:
c. pizza
Explanation:
Pizza is a heterogeneous mixture because it components are not uniform.
newto 's first law of motion states than an object motion will not change unless blank
newton's first law of motion states than an object motion will not change unless subjected to an external force.
why plastic do not rust
Answer:
it can't rust simply because it doesn't contain any iron or any of it's alloys. In fact, not even all metals rust.
Explanation:
Extended networks of pi bonds can cause a delocalization of electrons. Explain how this occurs.
Electrons in pi bonds can spread over a group of atoms. This is what is meant by delocalization of a pi bonded network.
There are two kinds of bonds in chemistry, these are;
Sigma bondsPi bondsSigma bonds are formed by end to end overlap of atomic orbitals while pi bonds are formed by side by side overlap of atomic orbitals.
Sometimes, pi orbitals are well oriented in such a way that electrons are spread over the pi orbitals of several atoms. For instance, in benzene, there are six pi electrons that are spread over the six carbon atoms in benzene. This is what is meant by delocalization.
Delocalization can only occur when there is are conjugated double bond. This is why delocalization is common in many aromatic compounds. Some inorganic ions such as CO3^2- also have delocalized pi electrons.
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kinetic energy is energy that an object possesses because of its
Kinetic energy is the energy possessed by an object due to its motion. If an object is moving, then it has kinetic energy. If an object has kinetic energy, then it is moving. Many students confuse kinetic energy with potential energy.
If 96.5 grams of gold has a volume of 5 cm, what is the density of gold?
what is the significant figures of 12.00
Is neon magnetic ? Also what id its freezing point?
Answer:
diamagnetic -415.5 degrees F so yea on the magnetic part
Explanation:
Question
Which two of these options does the transfer of light energy require?
A. Magnetic fields
B.Electric fields
C. Gravitational forces
D. Geometric figures
Answer: A,B
Explanation:
Answer: A. Magnetic fields
B. Electric fields
Explanation:
Base your answers to questions on the food web below and on your knowledge of science. Answer each part below. A. Which organism labeled in this food web provides energy, either directly or indirectly, to all of the other organisms? Explain why this is your answer. B. Explain why the amount of food available to the slug population might increase if the aphid population decreased.
Answer A:
The organism which provides energy directly and/or indirectly to all of the other organisms is the garden plants.
Explanation:
Plants are generally found at the lowest part of the pyramid/food chain. They are also called Autorotrophs because they are the primary producers of energy from which the entire pyramid feeds off.
The other animals/organisms on the pyramid are called Heterotrophs because they depend directly or indirectly on the primary energy producers.
Answer B:
The Slug and the Aphid feed are herbivorous. So they are in competition for the garden plants. If one of them, for some reason, decreased in population, the other will have more food to eat.
Cheers
In humans, having freckles is dominant over not having freckles. Andrew does not have freckles. What is his genotype for freckles? A) ff B) FF C) fF D) Ff
Answer:
A)ff
Explanation:
its A bc, how you would write a dominate trait for having freckles is FF and how you would write a ressive(cant spell that word sorry) trait for having freckles is ff. if Andrew does not have freckles then he is a ressive, ff. and also my teacher told me that u always write a dominate trait before a ressive trait unless u r doing a tri hybrid cross or something else.
Describe how the organelles in a cell work together to keep an organism alive
Answer:
These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA. ... All of the cell's organelles must work together to keep the cell healthy.
Explanation:
These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it's own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell's activities and stores DNA. ... All of the cell's organelles must work together to keep the cell healthy.
Please help!
The ________ the handle of a wrench, the _________ the mechanical advantage.
longer, greater
shorter, greater
shorter, less
shorter, less
Answer:
longer, greater;
Explanation:
This is more of a physics question. Refer to any notes you might have on simple machines. In short though, a wrench with a longer handle requires less force to be used than a wrench with a short handle. As a result it has more mechanical advantage.
The answer "shorter, less " could also be correct but it's listed twice so I wouldn't pick it.
Answer:
long,great
Explanation:
wich organelle is found in photosynthesis organisims and caprures energy from the sun
Plastid is the organelle that can the substance. chlorophyll that performs photosynthesis
Can somebody please explain the heat formula to me? q=mcΔt
Thank you!!
Answer:
Explanation:
It describes how much heat must be added to a unit of mass of a given substance to raise its temperature by one degree Celsius. ... The mass m, specific heat c, change in temperature ΔT, and heat added (or subtracted) Q are related by the equation: Q=mcΔT.
Answer:
The formula q=mcΔt explained below
Explanation:
so q represents the amount of heat energy. M is the mass of the object and c is the temperature of the object. Δt also known as delta is the change in temperature. It would be the final temperature minus the original temperature.
Jose completed an observational investigation to determine how many butterflies visited his garden each hour for one day Which option best explains why would Jose choose to complete an observational investigation?
He was able to count the number and type of butterflies that visited the garden,
He was observing the behavior of butterflies and could not control the variables
O He wanted to test how he could increase the number of butterflies visiting his garden
He was able to create a model of his garden showing the location of flowers and butterflies.
Answer:
He was able to count the number and type of butterflies that visited the garden,
Explanation:
Can an organism be made of only one cell?
Convert the following 2856 m(meters) to km(kilometers)Immersive Reader
a. 2,856,000 km
b. 2.956 km
c. 28.56 km
d. 0.02856 km
Answer: 2.856km
Explanation: 1000m = 1km
2856m / 1000 = 2.856km
carbon has 4 electrons in the outer shell .how does carbon attain stable electronic configuration!if ur answer it 21 points + i wil mark as brainlist so dont miss it
Answer:
through covalent bond
50 Points!! 25 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer:
1:f 2:a 3:c 4:e 5:c 6:d 7:b 8:f 9:a 10:d 11:c 12:c 13:b
Explanation:
An ion has an overall charge of -2. Its the nucleus is made up of 29 protons and 35 neutrons. How many electrons does the atom have?
Answer:
31 electrons.
Explanation:
Atoms initially have a neutral charge. So if this atom were neutral, it would have 29 electrons to balance out with the 29 protons. Protons are never added or removed. Since this atom has a -2 charge, that means it is an anion with 2 additional electrons. 29e- + 2e- = 31e-
they are located between each of the atrium and ventricle to prevent blood from flowing backwards, what is it?
Which of the following best describes the impact of glaciers upon the surface of the earth?
a.
Ice buried continents under a few hundred feet of ice.
b.
Glaciers scraped across the surface and altered landscapes and the course of rivers.
c.
The passage of glaciers created new ecosystems.
d.
All of the above.
Answer:
New Answer is : B - Glaciers scraped across the surface and altered landscapes and the course of rivers.
Explanation:
Edge 2020
The impact of glaciers on the surface is that glaciers scraped across the surface and altered landscapes and the course of rivers.
What is a glacier?A glacier refers to a heap of ice that has stayed there for a large number of years. The earth is filled with many glaciers and about 90% of fresh water are trapped in glaciers.
The impact of glaciers on the surface is that glaciers scraped across the surface and altered landscapes and the course of rivers.
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Why are journal articles important in the spread of scientific knowledge?
Help me pls guy’s
Answer:
When published, each article expands the library of scientific literature available to all scientists and contributes to the overall knowledge base of the discipline of science. They report new research for the first time.
Using dimensional analysis How many mg are there in 8.75 X 107 kilograms?
Conversion factors:
[1000 g = 1 Kg]
[1000 mg = 1 g]
Can you please show the work
Answer:
8.75×10¹³ mg
Explanation:
From the question given above, we obtained:
Mass (in Kg) = 8.75×10⁷ Kg
Mass (in mg) =?
Next, we shall convert 8.75×10⁷ Kg to grams (g). This can be obtained as follow:
1 Kg = 1000 g
Therefore,
8.75×10⁷ Kg = 8.75×10⁷ Kg × 1000 g/1 kg
8.75×10⁷ Kg = 8.75×10¹⁰ g
Therefore, 8.75×10⁷ Kg is equivalent to 8.75×10¹⁰ g.
Finally, we shall convert 8.75×10¹⁰ g to mg. This can be obtained as illustrated below:
1 g = 1000 mg
Therefore,
8.75×10¹⁰ g = 8.75×10¹⁰ g × 1000 mg/ 1 g
8.75×10¹⁰ g = 8.75×10¹³ mg
Thus, 8.75×10⁷ Kg is equivalent to 8.75×10¹³ mg.
Calculate the average atomic mass of a
sample of lead that is 24.1% lead-206
(205.974 amu), 22.1% lead-207 (206.976 amu)
and 53.8% lead 208 (207.977 amu).
Answer: 207.217 amu
Work:
203.973 amu *(0.014) = 2.855 amu
205.974 amu *(0.241) = 49.639 amu
206.976 amu *(0.221) = 45.741 amu
207.977 amu *(0.524) = 108.979 amu
2.855 + 49.639 + 45.741 + 108.979 = 207.217amu
Explanation:
The average atomic mass has been defined to be the total mass given by the relative abundances and masses of the isotopes. The average atomic mass of lead is 204.359 amu.
What is average atomic mass?The average atomic mass has been given by the masses and relative proportions and abundances of the isotopes of the elements that differ from the mass of the element in the periodic table. It is the average mass given by the sum of the masses and the abundances.
Given,
Abundance of lead-206 = 24.1%
The abundance of lead-207 = 22.1%
The abundance of lead-208 = 53.8%
Mass of lead-206 = 205.974 amu
Mass of lead-207 = 206.976 amu
Mass of lead-208 = 207.977 amu
The average atomic mass is given as:
= (205.974 × 0.241) + (206.976 × 0.221) + (207.977 × 0.524)
= 49.639 amu + 45.741 amu + 108.979 amu
= 204.359 amu
Therefore, 204.359 amu is the average atomic mass.
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The difference between a mixture and a solution is that mixtures cannot be easily separated. True O False.
Answer:
False
Explanation:
Mixtures are a solute and solvent that are not chemically combined, therefore easily separated. Solutions are a solute and solvent combined together.
plss
tell
the
ans
.............
Answer:
b option will be the answer because in b option the light rays are coming in the eyes and you will be able to see the thing written on the sheet of paper
i hope you got it if yes please mark it as brainliest
what is meant by the Terrestrial and Hydrologic parts of Earth?
Not sure what you exactly mean, but I think what you are talking about are the spheres of earth (Lithosphere, Hydrosphere, Atmosphere, and Biosphere.)
Lithosphere (Terrestrial) is the land on earth. Hydrosphere (Hydrologic) is the water on earth.
I'm not sure if this is 100% correct but I'm guessing this is what you are referring to. It could be different across different science classes.
