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What is the decay constant? watch

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    I am looking for a definition of what the decay constant is?
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    This is the proportionality constant between the rate of radioactive nuclear decay and the number of radioactive nuclei remaining.
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    http://en.wikipedia.org/wiki/Decay_constant
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    the probability that an atom of a particular isotope will decay in a certain amount of time
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    The fraction of present nuclei which decay per unit time, given the time interval is small.
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    This is why I hate definitions in physics exams :p: I was just about to ask this myself and its annoying how every person so far has given a different answer, and despite the fact that they all seem to be right, the mark schemes usually only have one acceptable version of it . Sorry if im being a little pedantic here
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    If in doubt, just write the damn equation and point out the very letter signifying it.
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    It is the probability that a nucleus (of radioactive isotope) will decay in a given time period.
 
 
 
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