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The half-life of a radioactive substance is the time it takes for half of the original amount of the substance to decay. It is a constant value unique to each radioactive isotope and is used to describe the rate of decay of the substance.
The half life of a radioactive element means that half the atoms in that element will decay in that amount of time eg Uranium 238 the most prevalent isotope in Uranium ore has a half life of 4.46 billion years, so half the atoms in any sample of this element will take this length of time to decay.
The half life of something is how long it takes for half of it to disintegrate. e.g. the half life of something is 3 seconds and you have 10 kg of it. after 3 secs you will have 5kg then 2.5 kg then 1.25 kg so on
What is the best definition of the term DRUG?
A drug is a substance that has a physiological effect when introduced into the body, altering its function or structure. Drugs can be used for medicinal purposes to treat illness, or recreationally for their psychoactive effects.
What definition best describes the word drug?
A drug is a substance that has the potential to alter the functioning of the body or mind and is typically used for medical purposes, recreation, or enhancement of performance.
What definition best describe an acid?
An acid is a substance that donates a proton or accepts an electron pair in a chemical reaction. Acids typically have a sour taste and can turn blue litmus paper red.
What is the best definition Of compound?
Two or more words put together to create a single, complex idea
What definition best describes acid?
A substance in a solution that releases hydrogen ions and lowers the pH APEX
Best definition of half-life for a radioactive substance?
The half-life of a radioactive substance is the time it takes for half of the atoms in a sample to decay. It is a constant characteristic of each radioactive isotope. After one half-life, half of the original substance will remain, and the other half will have decayed into other elements.
What is the best definition of half life for a radioactive substance?
The time taken for the radioactivity to halve its intensity, starting from any arbitrarily chosen instant.
Is the best definition of radioactive decay?
Radioactive decay is the spontaneous breakdown of a nucleus into smaller parts.
What is the best definition of radioactive decay?
Radioactive decay is the spontaneous breakdown of a nucleus into smaller parts.
Which of these is the best definition for histamine?
Histamines: A substance that sends more blood to an injured area.
What is the best definition of chemical change?
A change in a substance where one or more new substances form.
Which definition best describes an acid?
A substance in a solution that releases hydrogen ions and lowers the pH APEX
What definition best describes and acid?
A substance in a solution that releases hydrogen ions and lowers the pH APEX
which definition best describes a base?
a substance in a solution that captures hydrogen ions and raises the pH. apex
What is the best known radioactive element?
Probably uranium is the best known radioactive element.
What is the best definition of a physical change?
A change in a substance with no new substances being formed (Apex)
What is the best definition of temperature?
Temperature is a measure of the motion of particles in a substance.
