Cell: Structure and Functions
The half-life of 3890Sr is 28 years. What is the disintegration rate of 15 mg of this isotope?
The neutron separation energy is defined as the energy required to remove a neutron from the nucleus. Obtain the neutron separation energy of the nuclei 1327Al from the following data:
When charcoal is prepared from a living tree, it shows a disintegration rate of 15.3 disintegration of 14C per gram per minute. A sample from an ancient piece of charcoal shows . 14C activity to be 12.3 disintegration per gram per minute . how old is this sample? half-life of 14C is 5730 y.
A pieces of bone an animals from a ruin is found to have 14C activity of 12 disintegrations per minute per gm of its carbon content. The14C activity of of a living animal is 16 disintegration per minute per gm How long ago nearly did the animal die?
(Given half of life 14Cis t1/2=5760 years)
Calculate and compare the energy released by (a) Fusion of 1.0 kg of hydrogen deep within Sun (b) The fission of 1.0 kg of 235U in a fission reactor
The Q value of a nuclear reaction, A + b → C + d, is defined by
where, the masses refer to the respective nuclei. Determine from the given data the Q-value of the following reactions and state whether the reactions are exothermic or endothermic.
Atomic masses are given to be
Suppose India had a target of producing by 2020 AD, 200,000 MW of electric power, ten percent of which was to be obtained from nuclear power plants. Suppose we are given that, on an average, the efficiency of utilization (i.e. conversion to electric energy) of thermal energy produced in a reactor was 25%. How much amount of fissionable uranium would our country need per year by 2020? Take the heat energy per fission of 235U to be about 200 MeV.
In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are 1224Mg (23.98504u), 1225Mg (24.98584u) and 1226Mg (25.98259u). The natural abundance of 1224Mg is 78.99% by mass. Calculate the abundances of other two isotopes.