A radioactive element has half life period 800 years. After 6400 years what amount will remain?
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A radioactive decay is considered to be a first order process where the nuclear radioactivity of decay of a collection of nuclei is directly proportional to the total number of nuclei present.
It is governed by the law of radioactivity given by the equation dN/dt = k*N.
After keeping this equation into consideration, we can understand that after half-life, half of the number of nuclei remains so, if No is the initial number of nuclei then after first it will be T1/2 = No/2, second T1/2= No/4 , third T1/2= No/8 and so on.
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