Multiple Choice QuestionsThe scientist who is credited with discovery of 'nucleus' in an atom is
Rutherford
Niels Bohr
Balmer
J J Thomson
In nuclear fission the percentage of mass converted into energy is about
0.01 %
10 %
1 %
0.1 %
D.
0.1 %
Fission is a process in which heavy atoms breaks in two lighter ones by bombardment of neutrons, a, particles etc, because of this a mass defect (Δm) is created, which is converted into energy. Only 1% mass is utilised to convert energy. 0.1 to 0·5 % mass is only converted into energy. This is the order of mass conversion.
In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life ?
63 %
69.3 %
37 %
50 %
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