The half life of a radio isotope is four hours. If the initial mass of the isotope was 200 g the mass remaining after 24 hours undecayed is

The half life of a radio isotope is four hours. If the initial mass of

1.	The half life of a radio isotope is four hours. If the initial mass of the isotope was 200 g the mass remaining after 24 hours undecayed is
Answer» 1.042 G 4.167 g 3.125 g 2.084g Solution :`t_(1//2)=4` hr No. of half lives in 24 hours, `n=(24)/(4)=6` `N_(0)=200` g `N=(N_(0))/(2^(n))=(200)/(2^(6)) g` `=(200)/(64)=3.125 g`