St. Britto Hr. Sec. School - Madurai
12th Physics Monthly Test - 3 ( Atomic and Nuclear physics )-Aug 2020
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Write the properties of cathode rays.
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Why are heavy nuclei unstable?
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What is meant by fissile material? Give an example for fissile material?
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What is half-life of nucleus? Give the expression.
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Define Roentgen.
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What causes the sun to expand?
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What are the constituent particles of neutron and proton?
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If the total number of neutrons and protons in a nuclear reaction is conserved how than is the energy absorbed or evolved in the reaction? Explain.
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Show that the decay rate 'R' of a sample of a radionuclide is related to the number of radioactive nuclei 'N' at the same instant by the expression R = \(\lambda\)N.
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What is the diameter of H2 atom?
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What are radioactive elements? What are the factors that affect radio activity?
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What does a neutron moderator do?
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With respect to power generation, what are the relative advantages and disadvantages of fusion type and Fission type reactors?
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Write the properties of neutrino?
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Energy released per fission of a nucleus is of the order of 200 MeV whereas that per fusion is of the order of 10 MeV. But a fusion bomb (Hydrogen bomb) is said to be more powerful than a fission bomb. Explain why?
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Define atomic mass unit. Find its energy equivalent in MeV.
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Calculate the amount of \(^{ 210 }_{ 84 }\)Po required to the particle of activity 5 millicurie. Given half-life of Po = 138 days, NA = 6.023 x 1023, 1 curie= 3.7 x 1010 disintegrations.
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Explain the variation of average binding energy with the mass number by graph and discuss its features.
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Determine the distance of closest approach when an alpha particle of kinetic energy 4.5 MeV strikes a nucleus of Z = 80, stops and reverses its direction.
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About 185 MeV of usable energy is released is the neutron induced fissioning of a \(^{ 235 }_{ 92 }\)U nucleus. If the reactor using \(^{ 235 }_{ 92 }\)U as fuel continuously generates 100 MW of power, how long will it take for 1 kg of the uranium to be used up?
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Two stable isotopes of lithium \(^{ 6 }_{ 3 }\)Li and \(^{ 7 }_{ 3 }\)Li have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u respectively. Find the atomic mass of lithium.
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In the Bohr atom model, the frequency of transitions is given by the following expression
v = Rc \(\left( \frac { 1 }{ { n }^{ 2 } } -\frac { 1 }{ { m }^{ 2 } } \right) \),where n < m, Consider the following transitions:
Transitions m \(\rightarrow\) n 1 3 \(\rightarrow\) 2 2 2 \(\rightarrow\) 1 3 3 \(\rightarrow\) 1 Show that the frequency of these transitions obey sum rule (which is known as Ritz combination principle)
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In a fusion reactor, the reaction occurs in two stages.
(i) Two deuterium (\(^{ 2 }_{ 1 }\)D) nuclei fuse to form a tritium (\(^{ 3 }_{ 1 }\)T) nucleus with a proton as product.
(ii) A tritium nucleus fuses with another deuterium nucleus to form a helium (\(^{ 4 }_{ 2 }\)He) nucleus with neutron as another product.
Find (a) the energy released in each stage. (b) the energy released in the combined reaction per deuterium and (c) what percentage of the mass energy of the initial deuterium is released?
Given : \(^{ 2 }_{ 1 }\)D = 2.014102 u, \(^{ 3 }_{ 1 }\)T = 3.016049 u, \(^{ 4 }_{ 2 }\)He
= 4.002603 u, \(^{ 1 }_{ 1 }\)H = 1.007825 u, \(^{ 1 }_{ 0 }\)n
= 1.008665 u, Take 1u = 931 MeV -
For a radioactive material, half-life period is 600s. If initially there are 600 number of molecules, find the time taken for disintegration of 450 molecules and the rate of disintegration.
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A radioactive nucleus X converts into stable nucleus Y. Half-life of X is 50 years. Calculate the age of radioactive sample when the ratio of X and Y is 1 : 15.
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A radioactive isotope has a half-life of T years. How long will it take the activity to reduce to 3.125% of its original value?
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