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• CBSE×
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# Nuclear Energy Free Doubts and Solutions

## A heavy nucleus X of mass number 240 and binding energy per nucleon 7.6 MeV is split into two fragments Y and Z of mass numbers 110 and 130. The binding energy of nucleons in Y and Z is 8.5 MeV per nucleon. Calculate the energy Q released per fission in MeV.

Asked by Topperlearning User 2nd June 2015, 1:09 PM

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## What is Q- value of a nuclear reaction?

Asked by Topperlearning User 2nd June 2015, 1:03 PM

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## A neutron is absorbed by a 3 L nucleus with subsequent emission of - particle Write the corresponding nuclear reaction. Calculate the energy released in this reaction. Given mass of 3 L = 6.015126 a.m.u. Mass of 2e = 4.000 26044 a.m.u. Mass of neutron = 1.0086654 a.m.u. Mass of tritium = 3.016049 a.m.u.

Asked by Topperlearning User 2nd June 2015, 10:23 AM

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## Calculate the amount of energy released during the a decay of   Atomic mass of  = 238.05079 u Atomic mass of  = 234.04363 u Atomic mass of  = 4.00260 u 1u = 931.5 Me V/c2 Is this decay spontaneous? Give reason.

Asked by Topperlearning User 2nd June 2015, 9:11 AM

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## The nucleus of an atom of , initally at rest decay by emitting an -particle as per the equation Energy. It is given that the binding energies per nucleon of the parent and the daughter nuclei are 7.8 MeV and 7.835 MeV respectively and that of - particle is 7.07 MeV/nucleon.Assuming the daughter nuleus to be formed in the unexcited state and neglecting the energy of the reaction, calculate the speed of the emitted - particle. Take mass of - particle to be 6.68 x 10-27 kg

Asked by Topperlearning User 2nd June 2015, 9:08 AM

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## Would the energy be release or needed for the following D - T reaction: to occur? Given m = 2.014102 u m = 3.016049 u m = 4.002603 u m = 1.008665 u and 1 u = 931 MeV/c2 Calculate the energy in MeV.

Asked by Topperlearning User 29th May 2015, 2:35 PM

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## why is neutron so effective as a bombarding particle?

Asked by haider.samina 7th March 2015, 10:44 AM

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## why an alpha particle but not a proton is emitted by radioactive nuclei?

Asked by haider.samina 7th March 2015, 10:39 AM

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## Q.In a fusion/fission , the number of neutron and proton remains the same on both sides then how does mass converts into energy?

Asked by Ravi consul 4th March 2015, 6:44 PM

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## <div>a nucleus of mass number A originally at rest emits alpha particle with speed v the recoil speed of the daughter nucleus is or (ans. 4v<img class="Wirisformula" src="https://images.topperlearning.com/topper/tinymce/integration/showimage.php?formula=7db133b30c01c3fe2b126fa81b28d331.png" alt="bevelled blank over blank" align="middle" />A-4) how?</div>

Asked by Nidhi 26th December 2014, 1:56 PM

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## A nucleus undergoes β- decay and becomes , Calculate the maximum kinetic energy of electrons emitted assuming that the daughter nucleus and anti- neutrino carry negligible kinetic energy.

Asked by Topperlearning User 9th July 2014, 12:48 PM

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## A heavy nucleus X of mass number 240 and binding energy per nucleon 7.6 MeV is split into two fragments Y and Z of mass numbers 110 and 130. The binding energy of nucleons in Y and Z is 8.85 MeV per nucleon. Calculate the energy Q released per fission in MeV.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## A nucleus undergoes decay and becomes . Calculate the maximum kinetic energy of electrons emitted assuming that the daughter nucleus and anti-neutrino carry negligible kinetic energy.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## State the reason, why heavy water is generally used as a moderator in a nuclear reactor.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## Draw a plot of potential energy of a pair of nucleons as a function of their separation. What is the significance of negative potential energy in the graph drawn?

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## Why is the mass of a nucleus always less than the sum of the masses of its constituents, neutrons and protons? If the total number of neutrons and protons in a nuclear reaction is conserved, how then is the energy absorbed or evolved in a reaction? Explain. OR Draw a graph showing the variation of binding energy per nucleon with mass number for different nuclei. Explain, with the help of this graph, the release of energy by the process of nuclear fusion.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## In a nuclear reactor the chain reaction is carried out under controlled conditions. (a) Name the material that is used as control rods in a nuclear reactor. (b) Average energy of a neutron produced in fission of nucleus is ____ (c) Write down the reactions involved in the conversion of in a nuclear reactor.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## (a) In a nuclear reaction through the number of nucleons s conserved on both sides of the reaction, yet the energy is released. How? Explain. (b) Draw a plot of potential energy between a pair of nucleons as a function of their separation. Mark the regions where potential energy is (i) positive and (ii) negative.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## The binding energy per nucleon of the two nuclei A and B are 4 MeV and 8.2 MeV. Which of the two nuclei is more stable.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## State the reason, why heavy water is generally used as a moderator in a nuclear reactor.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## Draw a curve between mass number and binding energy per nucleon. Give two salient features of the curve. Hence define binding energy?

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## Express 16mg mass into equivalent energy in electron volt?

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## Why is nuclear fusion not possible in laboratory?

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## Binding energies of 8O16 and 17Cl35 are 127.35 MeV and 289.3 MeV respectively. Which of the two nuclei are more stable?

Asked by Topperlearning User 4th June 2014, 1:23 PM