Recent questions in Nuclei

Complete the reaction : $n+_{92}U^{235} \to _{56} Ba^{144} $+ _____ $ + 3n $

asked Aug 16, 2016 by meena.p

1 answer

The binding energy of deuteron is $2.2 \;Mev$ and that of $_2He^4$ in $28\;Mev$ . If two deuterons are fused to form one $_2He^4$, then the energy released is

asked Aug 16, 2016 by meena.p

1 answer

A radioactive substance decays to $ \large\frac{1}{16}$ of its initial activity in 40 days . The half life of the radio active substance expressed in days is

asked Aug 16, 2016 by meena.p

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The radius of $G_e$ nuclide is measured to be twice the radius of $_4 Be^9$ . The no nucleolus in $Ge$ are

asked Aug 16, 2016 by meena.p

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Half lives of two ratio active substance A and B are respectively 20 minutes . Initially the samples of A and B have equal number of nuclei. after 80 minutes the ratio of remaining numbers of A and B nuclei is

asked Aug 10, 2016 by meena.p

1 answer

Two H atoms in the ground state collide inelastically . The maximum amount by which their combined kinetic energy is reduced is

asked Aug 10, 2016 by meena.p

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Taking the Bohr radius as $a_0 = 53\;pm$ the radius of $Li^{++}$ ion in its ground state on the basis of Bohr's model will be about

asked Aug 10, 2016 by meena.p

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Obtains the maximum kinetic enery of $\beta$ particles and the radiation frequencies of $\gamma$ decays in the delay scheme . You are given that $m(_{79}Au^{198})=197.9682334\;u$$\qquad m(_{80}Hg^{198})=197.966760\;u$

asked Aug 10, 2016 by meena.p

1 answer

Consider the so called $D-T reaction$ (determination - tritium) calculate the energy released in Mev in this reaction from the data $m(_1H^2)=2.0141024 $ and $m(_1H^3) =3.0160494$

asked Aug 9, 2016 by meena.p

1 answer

Consider the so called D -T reaction (deuterium - tritium fusion ) $_1H^2 +_1H^{3} \to _2He^{4} +n$ consider the radius of both detriment and tritium to be approximately $2.0\;fm$ . What is the kinetic energy needed to overcome the coulomb repulsion between the two nuclei? To what temperature must the gases be heated to initiate the reaction ?

asked Aug 9, 2016 by meena.p

1 answer

Consider the fission of $_{92}U^{238}$ by fast neutrons. In one fission event , no neutron are emitted and the final stable end products , after the beta decay of the primary fragments are $_{58}Ce ^{140}$ and $_{44}Ru ^{99}$ . Calculate Q for this fission process . The relevant atomic and particle masses are :$m(_92U^{238})=238.05079\;u$$m(_{34} Ru^{99}) = 98.90594\;u$$m(_{58}Ce^{140})=139.90543\;u$

asked Aug 9, 2016 by meena.p

1 answer

Under certain circumstance , a nucleolus can decay by emitting a particle more massive than an $ \alpha$ particle . Consider the following : $_{88}Ra^{223} \to _{86} Rn ^{219} +_2 He ^{14}$ Calculate the Q value for this decay and determine if it energetically possible .

asked Aug 9, 2016 by meena.p

1 answer

Under certain circumstance , a nucleolus can decay by emitting a particle more massive than an $ \alpha$ particle . Consider the following : $_{88}Ra^{223} \to _{82} Pb ^{209} +_6C^{14}$ Calculate the Q value for this decay and determine if it energetically possible .

asked Aug 5, 2016 by meena.p

2 answers

A Source contains two phosphors radio nuclides $ _{15}P^{32}(T_{1/2}=14.3\;days)$ and $_{15}P^{33} (T_{1/2} =25.3\;day)$ Initially $10\%$ of the decays come from $_{15}P^{33}$. How long one must wait until $90\%$ do so ?

asked Aug 5, 2016 by meena.p

1 answer

The neutron separation energy is defined to be the energy required to remove a neutron from a nucleus. Obtain the neutron separation energy of the nuclei $_{20}Ca ^{41}$ from the following data :$_{13} Al ^{27} \to _{13}Al^{26}+_0 n^1$

asked Aug 5, 2016 by meena.p

1 answer

The neutron separation energy is defined to be the energy required to remove a neutron from a nucleus. Obtain the neutron separation energy of the nuclei $_{20}Ca ^{41}$ from the following data : $m(_{20}Ca^{40})=39.962591\;u,m(_{20}Ca^{41})=40.962278\;u,m(_{13}Al^{27})=26.981514\;u$

asked Aug 5, 2016 by meena.p

1 answer

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 $_{12} Mg^{24}(23.98504\;u)$, $_{12} Mg^{25}(24.98584\;u)$ and $_{12} Mg^{24}$ is $78.99\%$ by mass. Calculate the abundances of the other two isotopes.

asked Aug 4, 2016 by meena.p

1 answer

For the $\beta^+$ (positron) emission from a nucleus, there is another competing process known known as electron capture.Electron from an inner orbit is captured by the nucleus and a neutrino is emitted. $\beta^+$ emission is energetically allowed , electron capure is necessarily allowed but not vice- versa . Is this a true statement ?

asked Aug 4, 2016 by meena.p

1 answer

From the relation $R=R_0A^{1/3}$, where $R_0$ is a constant and A is the mass number of a nucleus , show that the nuclear matter density is nearly a constant (ie independent of A)

asked Aug 4, 2016 by meena.p

1 answer

Calculate the height of potential barrier for a head on collision of two denterons. The effective radius of deuteron can be taken to be $2 fm$ . Note that height of potential barrier is given by the coulmb repulsion between two denterons when they just touch each other .

asked Aug 3, 2016 by meena.p

1 answer

How long an electric lamp of $100 w$ be kept glowing by fusion of $2.0\;kg$ of deuterium ?

asked Aug 3, 2016 by meena.p

1 answer

A thousand reactor factor consume half of its fuel in 5.00 y . How much $_{92} U^{235}$ did it contain initially ? Assume that the reactor operates $80\%$ of the time and that all the energy generated arises from the fission of $_{92}U^{235}$ and that this nuclide is consumed by the fission process ?

asked Aug 3, 2016 by meena.p

1 answer

The fission properties of $_{84}Pu^{237}$ are similar to those of $_{92} U^{35}$ . The average energy released per fission is $180\;Mev$ How much energy in Mev is released if all the atoms in 1 kg of pure $_{94} Pu ^{239}$ undergo fission .

asked Aug 3, 2016 by meena.p

1 answer

Suppose we think of fission of a $_{26}Fe^{56}$ nucleus into two fragment $_{13} Al ^{26}$. Is the fission energetically possible ? Argue by working out Q of the process. cives.

asked Aug 3, 2016 by meena.p

1 answer

The Q value of a nuclear reaction $A+b=c+A$ is defined by $[m_A+m_b-m_c-m_d] C^2$ where masses refers to the respective nuclei. Determine from the given data the Q value of the following reaction and state whether the reaction are exothermic or endothermic . $_6C^{12}+_6C^{12} \to _{10}Ne^{20} +_2He^4$

asked Aug 2, 2016 by meena.p

1 answer

The Q value of a nuclear reaction $A+b=c+A$ is defined by $[m_A+m_b-m_c-m_d] C^2$ where masses refers to the respective nuclei. Determine from the given data the Q value of the following reaction and state whether the reaction are exothermic or endothermic .$_1H^1+_1H^3 \to _1H^2 +_1H^2$

asked Jul 22, 2016 by meena.p

1 answer

The nucleus $_{10} Ne ^{23}$ decays by $\beta ^{-}$ emission. write down the $\beta^{-}$ decay equation and determine the maximum kinetic energy of the electrons emitted from the following data. $ m (_{10} Ne ^{23} ) = 22.994466\;amu \;\qquad m (_{11} Na ^{23} ) = 22.989770\;amu $

asked Jul 22, 2016 by meena.p

1 answer

The radio nuclide $_6C^{11}$ decays according to $_6C^{11} \to _5B^{11}+e^++\gamma$ half life $=20.3\;min$ The maximum energy of the emitted position is $0.960\;Mev$ given the mass values $m(_6C^{11})=11.011434 \;u\;m (_6B^{11})=11.009305$ calculate Q and compare it with maximum energy of position emitted .

asked Jul 13, 2016 by meena.p

1 answer

Given $m(_{86} R_n ^{220} =220.1137\;u; m(_{84}Po^{216})=216.00189u$ and $m_{\alpha}=4.00260 \;u$ Find the Q value and K.E of the emitted $ \alpha$ particle in the $\alpha$ decay of $_{86} Rn ^{220}$

asked Jul 13, 2016 by meena.p

1 answer

Find the Q value and the kinetic energy of emitted $\alpha$ particle in the $\alpha$ decay of $_{88} Ra ^{226}$

asked Jul 13, 2016 by meena.p

1 answer

Obtain Approximately the ratio of the nuclear radii of the gold isotope $_{79} Au^{197}$ and silver isotope $_{4}Ag^{107}$

asked Jul 13, 2016 by meena.p

1 answer

The half life of $_{38} Sr ^{90}$ is 28 years . What is the disintegration rate of $15\;mg$ of this isotope?

asked Jul 13, 2016 by meena.p

1 answer

Obtain the amount of $_{27}Co^{60}$ necessary to provide a radio active source 0f $8.0\;mci$ strength. Half life of $_{27} Co ^{60}$ is $5.3$ years

asked Jul 13, 2016 by meena.p

1 answer

The normal activity of living carbon containing matter is found to be about 15 decays /min for every gram of carbon . This activity arises from the small proportion of radioactive $_6C^{14}$ present with the ordinary $_6C^{12}$ isotope. When the organism is dead , its interaction with the atmosphere Which maintains the above equilibrium activity ,ceases and its activity begins to drop. From the known half life $(=5730 years) $ of $_6C^{14}$ and the measured activity , the age of the specimen can be approximately estimated the approximate age of the Indus valley civilization

asked Jul 12, 2016 by meena.p

1 answer

A radio active isotope has a half of T years. How long will it take the activity to reduce to $1\%$ of its original activity .

asked Jul 12, 2016 by meena.p

1 answer

A radio active isotope has a half of T years. How long will it take the activity to reduce to $3.125\%$

asked Jul 12, 2016 by meena.p

1 answer

Write nuclear reaction equation for Electron capture of $_{54}X_e^{120}$

asked Jul 12, 2016 by meena.p

1 answer

Write the nuclear reaction equation for $\beta^{+}$ decay of $_{43}Tc^{97}$

asked Jul 12, 2016 by meena.p

1 answer

Write the nuclear reaction equation for $\beta^{+}$ decay of $_{6} C ^{11}$

asked Jul 12, 2016 by meena.p

1 answer

Write nuclear equation for $\beta^{-}$ decay of $_{83} Bi ^{210}$ $\beta^{-}$ decay of $_{83} Bi ^{210}$

asked Jul 12, 2016 by meena.p

1 answer

Write nuclear equation for $\beta^{-}$ decay of $_{11} P ^{32}$

asked Jul 12, 2016 by meena.p

1 answer

Write nuclear equation for $\alpha$ decay of $_{94} Pu ^{242}$

asked Jul 12, 2016 by meena.p

1 answer

Write the nuclear reaction for $\alpha$ delay of $_{88} Ra^{226}$

asked Jul 12, 2016 by meena.p

1 answer

A given coin has a mass of 3 o.g calculate the nuclear energy that would be required to separate all the neutrons and protons from each other . For simplicity assume the coin is entirely made of $_{29} Cu ^{63}$ atom (of mass 62.92960u)

asked Jul 12, 2016 by meena.p

1 answer

Obtain the binding energy of the nuclei $_{26} Fe^{56}$ and $_{23} Bi ^{209}$ in units of Mev from the following data $m_H= 1.007825\;amu\;m_n= 1.008665\;amu \; m( _{26} Fe ^{56})=55.934939 \;amu\; m( _{83} Fe ^{209})=208.980388 \;amu\;lamu=931.5\;Mev$ Which nucleus has greater binding energy per nucleon ?

asked Jul 11, 2016 by meena.p

1 answer

Obtain the binding energy of a nitrogen nucleolus $(_7N^{14})$ from the following data $m_n=1.00783 \;amu \; m_n =1.00867$ amn , $m_n=14.00307 \;amu$ give your answer in Mev

asked Jul 11, 2016 by meena.p

1 answer

The three stable isotopes of neon :$Ne^{20}, Ne^{21},Ne^{22}$ have respective abundances of $90 .51 \%, 0.27\%$ and $9.22\%$ . The atomic masses of three isotopes are $19.99$ amu , $20.99\;amu$ and $21.99\;amu$ Obtain the average atomic mass of neon .

asked Jul 11, 2016 by meena.p

1 answer

Boron has two stable isotope, $_5 B^{11}$ and $_5 B^{11}$ Their respective masses are $10.01294 \;amu$ and $11.00931\;amu$ and the atomic weight of Boron in $10.811\;amu$ . Find the abundances of $_5B^{ 10}$ and $_5B^{11}$

asked Jul 11, 2016 by meena.p

1 answer

Two Stable isotopes of lithium $^6_3Li$ and $^7_3 Li$ have respective abundances of $7.5\%$ and $92.5 \%$ These isotopes have messes $6.01512$ amu and $7.01600$ amu respectively . Find the atomic height of lithium

asked Jul 11, 2016 by meena.p

1 answer

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