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  4. A radioactive element has half-life period 1600 year. After 6400 year, what part of element will remain?

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Q. A radioactive element has half-life period $1600$ year. After $6400$ year, what part of element will remain?

Haryana PMTHaryana PMT 2003

Solution:

Number of half lives $=\frac{6400}{1600}=4$
So, amount of element left $=\frac{1}{2^{4}}=\frac{1}{16}$ part