What is the half-life of strontium-90? please explain your answer!
Answers
The right answer is 28 years.
The half-life, or period of a radioactive isotope, is the time required for half of the nuclei of this isotope initially present to decay naturally.
One gram of pure 90 strontium has a radioactivity of 5.11 TBq. Its beta radiation is not penetrating, which makes it difficult to measure when it is in the soil or a matrix. It is very harmful when the particle is inhaled or ingested.
The half life is exactly what it means. We want to know how many years it takes for the Strontium-90 to go from 100% to 50% to 25% etc
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Which are present when freezing rain occurs
In the what division of meiosis, chromosome pairs line up and then separate?
A(n) _____ is an abbreviation for the name of an element and has either one or two letters.1.) atomic mass 2.) chemical symbol 3.) nuclear fusion 4.) periodic table 5.) group 6.) plasma
Do you think you can accurately determine a person's genotype by observing his or her phenotype?
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Answer:
El entrecruzamiento cromosómico es un proceso biológico que ocurre durante la meiosis, cuando las parejas de cromosomas homólogos, o del mismo tipo, están alineadas. Durante la meiosis los cromosomas emparejados están alineados en las llamadas placas meióticas, y tienen un mecanismo biológico que los mantiene unidos.
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Answer:
acid rain has a pH value of 4.0.
Explanation:
so less than 7
B) Birch trees become covered in black ash from nearby factories.
C) Heavy rainfall causes birch trees to grow taller than normal.
D) Disease kills off more than half of the birch tree population.
Answers
The ash would help darker colored mothscamouflage on the bark. Therefore, option (B) is correct.
What is natural selection?
The process through which populations of living things adapt and evolve is known as natural selection. A population's members are naturally varied, which means that they are all distinctive in some respects. This variety indicates that some people have characteristics that are more environment-appropriate than others.
The peppered moth is a type of night-flying moth that lives in temperate regions. The majority of its occurrences are in the northern hemisphere, specifically in regions such as Asia, Europe, and North America. The evolution of the peppered moth is an illustration of population genetics and natural selection in action.
Black ash from adjacent industriescoats birch trees. Ash would aidmoths with darker colours in hiding on the bark. As a result, choice (B) is the right one.
Learn more about natural selection, here:
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Answer: B
Explanation:
The ash would help darker colored moths camouflage on the bark
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Hello :)
The Earth is 4.543 billion years old
and we find out by scientific techniques of radiometric dating
Hope this helps and have a great day
By dating the rocks in the ever-changing crust, as well as neighbors such as the moon and visiting meteorites, scientists have calculated that Earth is 4.54 billion years old, with an error range of 50 million years.
to secure the nucleus at the center of a cell
B.
to provide energy for the cell
C.
to provide immune defense for the cell
D.
to move materials in and out of the cell
Answers
Answer:
a
Explanation: