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61
To detect trace amounts of a gaseous species in a mixture of gases, the preferred probing tools is
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Answer & Solution
Answer: Option D
Solution:
In the field of nuclear and particle physics, when it comes to detecting trace amounts of a gaseous species in a mixture of gases, the preferred probing tool is laser spectroscopy.

Laser spectroscopy is a highly sensitive technique that utilizes laser light to interact with atoms or molecules, leading to characteristic absorption, emission, or scattering of light. This technique allows for precise identification and quantification of trace elements or species within a complex mixture of gases.

While other spectroscopic techniques like ionization spectroscopy with X-rays (Option A), NMR spectroscopy (Option B), and ESR spectroscopy (Option C) are valuable in various contexts, they may not offer the same level of sensitivity and specificity as laser spectroscopy when it comes to detecting trace amounts of gaseous species in a mixture.

Therefore, Option D: laser spectroscopy is the preferred probing tool for detecting trace amounts of a gaseous species in a mixture of gases in the field of nuclear and particle physics.
62
In a Stern-Gerlach experiment, the magnetic field is in +Z direction. A particle comes out of this experiment in $$\left| { + {\bf{\hat z}} \uparrow > } \right.$$  state. Which of the following statements are true?
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Answer & Solution
Answer: Option B
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63
By capturing an electron, $${}_{25}^{54}{\text{M}}{{\text{n}}_{29}}$$  transforms into $${}_{25}^{54}{\text{C}}{{\text{r}}_{30}}$$  releasing
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Answer & Solution
Answer: Option A
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64
The order of magnitude of the binding energy per nucleon in a nucleus is
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Answer & Solution
Answer: Option D
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65
The plot of log A vs time t, where A is activity as shown in the figure, corresponds to decay
Nuclear and Particle Physics mcq question image
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Answer & Solution
Answer: Option A
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66
As one moves along the line of stability from 56Fe to 235U nucleus, the nuclear binding energy per particle decreases from about 8.8 MeV to 7.6 MeV. This trend is mainly due to the
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Answer & Solution
Answer: Option B
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67
Weak nuclear forces act on
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Answer & Solution
Answer: Option B
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68
The following gives a list of pairs containing
i. a nucleus
ii. one of its properties
Find the pair which is inappropriate
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Answer & Solution
Answer: Option C
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69
The nucleus of the atom $${}_4^9{\text{Be}}$$  consists of
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Answer & Solution
Answer: Option B
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70
To explain the observed magnetic moment of deuteron (0.8574 μN), its ground state wavefunction is taken to be an admixture of S and D states. The expectation values of the z component of the magnetic moment in pure S and pure D states are 0.8797 μN and 0.3101 μN respectively. The contribution of the D state to the mixed ground state is approximately
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Answer & Solution
Answer: Option B
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