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If a certain radioactive substance has a half life of one year how many atoms of the substance remain after 5 years if there are initially 5000 such atoms?
Wiki User
∙ 14y ago
Half life refers to the time required for the change (decay) of a radioactive nucleus to a lighter, possibly more stable, nucleus.
Starting with 5,000 radioactive atoms, at the end of first year, half would have decayed leaving 2,500. Following the same pattern, the end of the second year would see only 1,250. By the end of year 5, there would be just 156 radioactive atoms.
Wiki User
∙ 14y ago
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A substance has different phases, but it only boils at a certain temperature. If it is over that temperature it will evaporate or if it is under that temperature it won't boil.
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If it was initially at rest - yes. If it was initially moving, it will continue moving at the same velocity.
DEFINITION OF SUBSTANCE?
Substance is any matter that exists around us. The properties of a substance remain same throughout.
For any pure substance the boiling point and melting point will always remain?
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