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Nuclear Physics Fundamentals - BMETENTBsPMFAI-00

Nuclear Physics Fundamentals - BMETENTBsPMFAI-00

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Which of the following statements about photon–matter interactions is false?

The photoelectric effect can occur on the outer, weakly bound electrons because the influence of the nucleus can then be neglected.

Pair creation is threshold process: E > 2mc^2.

In Compton scattering, a photon cannot transfer all of its energy to an atomic electron.

100%

I do not answer.

A photon beam cannot be completely shielded, only attenuated. The attenuation is characterised by the half-value layer of the material.

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What was the result of the Rutherford experiment?

The result of the experiment was independent of the angular distribution of the scattered alpha particles.

No deviation from the differential cross section for a point charge was observed in the scattering experiment, allowing an estimate of the maximum size of the charge distribution.

A deviation from the differential cross section for a point charge was observed in the scattering experiment, allowing an estimate of the maximum size of the charge distribution.

100%

Only forward scattering was observed in the scattering experiment.

I choose not to answer.

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Can the differential cross section of a process be finite while its total cross section is infinite?

No, this would lead to a contradiction.

No cross section can ever be infinite.

100%

Yes, if the interaction has infinite range.

An infinite total cross section is possible only if the differential cross section is also infinite.

I choose not to answer.

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Which statement about the root-mean-square (rms) charge radius of a nucleus is correct?

It is the maximum distance from the nuclear centre at which protons can be found.

❌

It is the average distance of the protons from the nuclear centre.

❌

It is the distance from the nuclear centre at which the charge density falls to half its central value.

❌

It is the square root of the mean squared distance of the nuclear charge distribution from its centre.

✅

I choose not to answer.

❌

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Which statement about an ionisation chamber is not true?

An electric field is required to collect the charge carriers.

It has a low intrinsic efficiency.

100%

It is a good insulator at room temperature.

Creating charge carriers requires 0.1-0.5 eV.

I choose not to answer.

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An odd-mass nucleus has a single unpaired nucleon in an orbital with l=3 and j=7/2. What spin and parity does the shell model predict for its ground state, assuming the remaining nucleons form a 0^+ core?

(7/2)+

(7/2)-

(5/2)+

I do not answer.

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Which of the following can also be pick-up reactions? (d denotes deuterium.)