Fast neutrons can easily be solved down by
- the use of lead shielding
- passing them through water
- elastic collision with heavy nuclei
- applying a strong electric field
The Correct Option is B
Solution and Explanation
Commonly used moderators include regular (light) water (roughly $75 \%$ of the world's reactors), solid graphite ( $20 \%$ of reactors) and heavy water.
Top Questions on Nuclear physics
- Select the correct statements among the following:
A. Slow neutrons can cause fission in \( \frac{235}{92}U \) more effectively than fast neutrons.
B. \( \alpha \)-rays are Helium nuclei.
C. \( \beta \)-rays are fast moving electrons or positrons.
D. \( \gamma \)-rays are electromagnetic radiations with wavelengths larger than X-rays.
Choose the answer from the options given below:- NEET (UG) - 2024
- Physics
- Nuclear physics
- \(^{290}_{82}X\stackrel{\alpha}{\rightarrow}Y\stackrel{e^+}{\rightarrow}Z\stackrel{\beta^-}{\rightarrow}P\stackrel{e^-}{\rightarrow}Q\)
In the nuclear emission stated above, the mass number and atomic number of the product Q respectively, are :- NEET (UG) - 2024
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- In a hypothetical fission reaction
\(^{92}X^{236} \rightarrow ^{56}Y^{141} + ^{36}Z^{92} + 3R\) The identity of emitted particles (R) is:- JEE Main - 2024
- Physics
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- Which of the following nuclear fragments corresponding to nuclear fission between neutron \[\left( ^1_0 n \right) \, \text{and uranium isotope} \, \left( ^{235}_{92} \text{U} \right) \, \text{is correct:}\]
- JEE Main - 2024
- Physics
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- In an alpha particle scattering experiment, distance of closest approach for the \(\alpha\) particle is \(4.5 \times 10^{-14} \, \text{m}\). If the target nucleus has atomic number 80, then maximum velocity of \(\alpha\)-particle is ______ \( \times 10^5 \, \text{m/s} \) approximately.
\[ \left( \frac{1}{4\pi \epsilon_0} = 9 \times 10^9 \, \text{SI unit}, \, \text{mass of } \alpha \, \text{particle} = 6.72 \times 10^{-27} \, \text{kg} \right) \]- JEE Main - 2024
- Physics
- Nuclear physics
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NaOH is deliquescent
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- Solutions
Concepts Used:
Nuclear Physics
Nuclear physics is the field of physics that studies atomic nuclei and their constituents and interactions, in addition to the study of other forms of nuclear matter. Nuclear physics should not be confused with atomic physics, which studies the atom as a whole, including its electrons
Radius of Nucleus
‘R’ represents the radius of the nucleus. R = RoA1/3
Where,
- Ro is the proportionality constant
- A is the mass number of the element
Total Number of Protons and Neutrons in a Nucleus
The mass number (A), also known as the nucleon number, is the total number of neutrons and protons in a nucleus.
A = Z + N
Where, N is the neutron number, A is the mass number, Z is the proton number
Mass Defect
Mass defect is the difference between the sum of masses of the nucleons (neutrons + protons) constituting a nucleus and the rest mass of the nucleus and is given as:
Δm = Zmp + (A - Z) mn - M
Where Z = atomic number, A = mass number, mp = mass of 1 proton, mn = mass of 1 neutron and M = mass of nucleus.