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How many undecayed headsium nuclei would remain in a sample of 600 nuclei after three half-lives?
After each half-life, the number of undecayed nuclei is halved. Starting with 600 nuclei, after one half-life, 300 would remain; after the second half-life, 150 would remain; and after the third half-life, 75 would remain. Thus, after three half-lives, 75 undecayed headsium nuclei would remain in the sample.
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What is the fraction of a sample of tritium that remains undecayed after fifty years?
After 50 years, approximately 50% of tritium will remain undecayed in a sample. Tritium has a half-life of about 12.3 years, which means that the amount of undecayed tritium decreases by half every 12.3 years.
Cs-137 is produced as a waste product in nuclear fission reactors What fraction remains undecayed after 241.84 years?
The half-life of Cs-137 is 30.08 years, so 0.0038 would remain after 241.84 years.
Why cells should remain small?
Not all calls are small. Slime molds for example have gigantic cells with tens of thousands of nuclei in each.
How can helium remain available for use on earth?
It is produced (slowly) by radioactive decay in the Earth's crust (Alpha radiation is helium nuclei). It doesn't react with anything, so when it escapes it remains in the air.
Why must products of nuclear fission be stored safely?
Products of nuclear fission, such as radioactive isotopes, have long half-lives and can remain hazardous to human health and the environment for thousands of years. Therefore, they must be stored safely to prevent accidental exposure, leakage, and contamination of the surroundings. Proper storage is crucial to minimize the risk of radiation exposure and ensure the protection of both current and future generations.
What is the fraction of a sample of tritium that remains undecayed after fifty years?
After 50 years, approximately 50% of tritium will remain undecayed in a sample. Tritium has a half-life of about 12.3 years, which means that the amount of undecayed tritium decreases by half every 12.3 years.
How many undecayed M and Ms would remain out of a sample of 600 M and Ms after three half lives?
75
What percent of a sample of As-81 remains undecayed after 43.2 seconds?
To determine the percentage of As-81 that remains undecayed after 43.2 seconds, you would need to know its half-life. As-81 has a half-life of approximately 46.2 seconds. Using the formula for radioactive decay, after one half-life (46.2 seconds), 50% would remain. Since 43.2 seconds is slightly less than one half-life, a little more than 50% of the sample remains undecayed, but the exact percentage requires calculations based on the exponential decay formula.
Cs-137 is produced as a waste product in nuclear fission reactors What fraction remains undecayed after 241.84 years?
The half-life of Cs-137 is 30.08 years, so 0.0038 would remain after 241.84 years.
What do a heavy nuclei need to remain stable?
Heavy nuclei need to have a balanced ratio of protons to neutrons to remain stable. They also need to have the strong nuclear force between nucleons overcome the electrostatic repulsion between protons. Additionally, the nuclei need to have a sufficient binding energy to hold the nucleus together.
What fraction of a radioactive nuclei remain after p half lives?
The remainder is 2-p or 0.5p of the original amount.
What is the difference between two nuclei in a covalent bond?
In a covalent bond, two nuclei share electrons to form a stable bond. The nuclei in a covalent bond do not lose their identity or mass. They remain intact within the bond, attracting the shared electrons to keep the bond stable.
Why cells should remain small?
Not all calls are small. Slime molds for example have gigantic cells with tens of thousands of nuclei in each.
What happens to the polar nuclei in an embryo sac?
The polar nuclei in an embryo sac are involved in the process of double fertilization in plants. One of the polar nuclei fuses with a sperm cell, leading to the formation of endosperm tissue, while the other polar nucleus may fuse with another sperm cell or remain unfertilized. The endosperm provides nutrients for the developing embryo in seeds.
Will the radioactive property remain in an ionic compound when a metal element is highly radioactive combined with a non-metal element which is non-radioactive?
A radioactive material is radioactive. Period. The atoms of radioactive material have unstable nuclei. If you combine them with other material, the radioactive material will remain unaffected as regards its radioactivity. Recall that radioactivity is related to the instability of atomic nuclei, and the atomic structure of atomic nuclei are (in general) not involved in chemical bonding. Chemical bonding doesn't affect the stability of the nuclei of atoms. If they are unstable, they will remain so whether the atoms are alone or chemically combined with something else.
What element is in a black hole?
It is not expected that elements would survive as such, within a black hole. Gravitational force would crush everything together to the point where no atomic nuclei remain intact.
What effect does the transfer of electrons have on the nuclei of the atoms involved in ionic bonding?
The transfer of electrons in ionic bonding causes the formation of charged ions (cations and anions). This transfer does not directly affect the nuclei of the atoms, as the nuclei remain unchanged in terms of their number of protons and neutrons. The attraction between the oppositely charged ions is what holds the ionic compound together.
