A) release of neutrons
B) release of electrons
C) greater mass of products than initial material
D) lesser mass of products than initial material
Correct Answer: D
Solution :
The source of large energy produced during atom bomb explosion is mainly due to lesser mass of products than initial material i.e., reactants. The loss of mass is called mass defect and the loss of mass is converted to energy according to Einstein equation. \[E=m{{c}^{2}}\] or \[\Delta E=\Delta m{{c}^{2}}\] where, \[\Delta E=\] energy released \[\Delta m=\]loss of mass i.e., mass defect c = velocity of light ag, \[_{92}^{235}U+_{0}^{1}n\xrightarrow{{}}_{56}^{140}Ba+_{36}^{93}Kr+3_{0}^{1}n\] Mass of U-235 + mass of neutron = 235.118650 + 1.008665 = 236.127315 u Mass of Ba - 140 + mass of Kr-93 + mass of three neutrons = 140.09117 + 92.79665 + 3 \[\times \] 1.008665 = 235.913815 u Loss in mass \[(\Delta m)\] = 236.127315 - 235.913815 = 0.2135 u We know energy released for the loss of mass 1 u = 931 MeV \[\therefore \] Energy released for the loss of 0.2315 u = 931 \[\times \] 0.2135 = 215.5 MeV
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