Chapter 18 – Atoms and Nuclei
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If N0 is the original mass of the substance of half-life period t 1/2 = 5 years, then the amount of substance left over 15 years is
04
Sep
If N0 is the original mass of the substance of half-life period t 1/2 = 5 years, then the amount of substance left over 15 years is If N0 is the original mass of the substance of half-life period t 1/2 = 5 years then the amount of substance left over 15 years is September [...]
If the binding energy of the electron in a hydrogen atom is 13.6eV, the energy required to remove the electron from the first excited state of Li^2+ is :
04
Sep
If the binding energy of the electron in a hydrogen atom is 13.6eV, the energy required to remove the electron from the first excited state of Li^2+ is : If the binding energy of the electron in a hydrogen atom is 13.6eV the energy required to remove the electron from the first excited state of [...]
In the nuclear fusion reaction 1 2H+ 1 3H→ 2 4He+n given that the repulsive potential energy between the two nuclei is −7.7×10^−14 J, the temperature at which the gases must be heated to initiate the reaction is nearly (Boltzmann’s constant k=1.38×10^−23 J/K)
04
Sep
In the nuclear fusion reaction 1 2H+ 1 3H→ 2 4He+n given that the repulsive potential energy between the two nuclei is −7.7×10^−14 J, the temperature at which the gases must be heated to initiate the reaction is nearly (Boltzmann’s constant k=1.38×10^−23 J/K) In the nuclear fusion reaction 1 2H+ 1 3H→ 2 4He+n given [...]
A radioactive sample at any instant has its disintegration rate 5000 disintegration per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant, per minute, is
04
Sep
A radioactive sample at any instant has its disintegration rate 5000 disintegration per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant, per minute, is A radioactive sample at any instant has its disintegration rate 5000 disintegration per minute. After 5 minutes is per minute the decay constant the [...]
When U 238 nucleus originally at rest, decays by emitting an alpha particle having a speed u , the recoil speed of the residual nucleus is
04
Sep
When U 238 nucleus originally at rest, decays by emitting an alpha particle having a speed u , the recoil speed of the residual nucleus is decays by emitting an alpha particle having a speed 'u' the recoil speed of the residual nucleus is When U 238 nucleus originally at rest September 4, 2021 Category: [...]
An α-particle of energy 5 MeV is scattered through 180^∘ by a fixed uranium nucleus. The distance of the closest approach is of the order of
04
Sep
An α-particle of energy 5 MeV is scattered through 180^∘ by a fixed uranium nucleus. The distance of the closest approach is of the order of An α-particle of energy 5 MeV is scattered through 180^∘ by a fixed uranium nucleus. The distance of the closest approach is of the order of September 4, 2021 [...]
The above is a plot of binding energy per nucleon Eb, against the nuclear mass M;A, B, C, D, E, F correspond to different nuclei. Consider four reactions : where ϵ is the energy released ? In which reaction is ϵ positive ?
04
Sep
The above is a plot of binding energy per nucleon Eb, against the nuclear mass M;A, B, C, D, E, F correspond to different nuclei. Consider four reactions : where ϵ is the energy released ? In which reaction is ϵ positive ? -e against the nuclear mass M;A B C D F correspond to [...]
A radioactive nucleus (initial mass number A and atomic number Z) emits 3 α-particles and 2 positrons. The ratio of number of neutrons to that of protons in the final nucleus will be
04
Sep
A radioactive nucleus (initial mass number A and atomic number Z) emits 3 α-particles and 2 positrons. The ratio of number of neutrons to that of protons in the final nucleus will be A radioactive nucleus (initial mass number A and atomic number Z) emits 3 α-particles and 2 positrons. The ratio of number of [...]
Statement – 1 : A nucleus having energy E1 decays by β− emission to daughter nucleus having energy E2, but the β− rays are emitted with a continuous energy spectrum having end point energy E1−E2. Statement – 2 : To conserve energy and momentum in β-decay at least three particles must take part in the transformation.
04
Sep
Statement – 1 : A nucleus having energy E1 decays by β− emission to daughter nucleus having energy E2, but the β− rays are emitted with a continuous energy spectrum having end point energy E1−E2. Statement – 2 : To conserve energy and momentum in β-decay at least three particles must take part in the [...]
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Assume that a neutron breaks into a proton and an electron. The energy released during this process is (Mass of neutron =1.6725×10^−27 kg ,
Mass of electron =9×10^−31 kg) ,
Mass of proton =1.6725×10^−27 kg ,
Statement - 1 : A nucleus having energy E1 decays by β− emission to daughter nucleus having energy E2 ,
A diatomic molecule is made of two masses m1 and m2 which are separated by a distance r. If we calculate its rotational energy by applying Bohr’s rule of angular momentum quantization, its energy will be given by: (n is an integer)
04
Sep
A diatomic molecule is made of two masses m1 and m2 which are separated by a distance r. If we calculate its rotational energy by applying Bohr’s rule of angular momentum quantization, its energy will be given by: (n is an integer) A diatomic molecule is made of two masses m1 and m2 [...]