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Radiochemistry and Nuclear Chemistry self-test # 11

Comprises Chapter 11

This is a self grading test of your knowledge. It consists of 20 randomly chosen questions with single or multiple answers. The questions with single answers have round buttons and the questions with perhaps more than one correct answer have square buttons. Answer the questions by clicking on the corresponding button in the list of alternative answers. On questions with a single answer (round buttons to click on), it is only possible to mark one of the alternative answers as correct.
Grading of the completed test is automatic when you click on the button marked "GRADE MY ANSWERS" at the end of the test.
Correct answers can be read by clicking on the button having the same number as the question. You find these buttons at the end of the test. You can also refresh your memory first by jumping directly to the answer buttons and click on them to get answers and read relevant parts of the book before doing this test.
On the questions with one or more possible answers (squares to click on) only the first click on each button is recorded as an answer. Hence you must click on the reset button below the question before you can change the original answer(s). Failure to do this will probably make the answers on this question regarded as wrong in the grading process.
Please observe that your teacher may require a deeper understanding of the treated subject than reflected by this test. In case you have any valuable comments or questions regarding this self-test, explain them in an e-mail to: jol@nc.chalmers.se 


Question # 1 (One answer) Explanations to observed phenomena can be based on assumed connections between cause and effect because it has been possible to show that the same cause always produces the same effect (result). Such an explanation is called

    A) a hypothesis
    B) a theory
    C) an assumption
    D) a model
    E) an equation

Question # 2 (Yes/No) Is there a nuclear model that can describe/explain all known nuclear phenomena?

    A) Yes
    B) No

Question # 3 (One or more answers) When the Schrödinger wave equation is applied on nucleons in a potential well only certain nucleon energy levels are permitted. These are defined by quantum numbers. Which of the following are such quantum numbers?

    A) The principal quantum number, n
    B) The azimuthal quantum number, l
    C) Bi-quantum number, b
    D) Gyromagnetic quantum number, m
    E) The nucleon number, A

In case of an error in the answers above, please click on this button before making any corrections 

Question # 4 (One answer) An individual particle, electron or nucleon, has a spin quantum number of

    A) 0
    B) 1/2
    C) 2/3
    D) 3/4
    E) 1

Question # 5 (One answer) A nuclear magneton has one of the following values. Which?

    A) 9.273x10-24 J/T
    B) 1.0 eV
    C) 3.142x10-25 T/J
    D) 5.051x10-27 J/T
    E) 16 T

Question # 6 (One or more answers) A prolate nucleus can change the direction of its main axis through one or more of the following processes.

    A) Translation
    B) Rotation
    C) Vibration
    D) Irrotation
    E) Compression

Question # 7 (One answer) An oblate nucleus has a shape which reminds us of a

    A) donut
    B) flying saucer
    C) pie
    D) tennis ball
    E) cigar

Question # 8 (One answer) The unit for quadrupole moment in the SI-system is

    A) s-1
    B) m/s
    C) m
    D) T
    E) m2

Question # 9 (One or more answers) For even-even nuclei it is true that

    A) l = 0
    B) K = ±2
    C) l = j
    D) m = ±2.792 n.m.
    E) the Pauli principle applies

In case of an error in the answers above, please click on this button before making any corrections 

Question # 10 (One answer) The NMR-frequency of nuclei can be used in chemistry because

    A) the nucleus is totally shielded against any disturbance from its surroundings
    B) the electrons in the atom partly screens the nucleus against external magnetic fields
    C) it has nothing at all to do with the properties and behavior of the nucleus
    D) the charge of the electrons repeals the protons present on the surface of the nucleus
    E) the frequency is only determined by the energy levels in the electron shell

Question # 11 (One answer) An electric quadrupole transition between two energy levels is indicated in a nuclear level scheme by

    A) E1
    B) E2
    C) E3
    D) E4
    E) M2

Question # 12 (One answer) A magnetic octupole transition between two energy levels in a nucleus causes a change in the nuclear spin by

    A) 1
    B) 3
    C) 5
    D) 7
    E) 8

Question # 13 (One answer) The ratio between observed and calculated half-life for a-decay is called

    A) the Jahn-Teller-factor
    B) the penetration factor
    C) the coulomb ratio
    D) the hindrance factor
    E) the Gamov-ratio

Question # 14 (One answer) Spontaneous fission only occurs in nuclei having A > 230. This is explained as caused by

    A) the fission barrierr
    B) supra-conductivity in the nucleus
    C) the shape of deformed nuclei
    D) superheavy elements
    E) Heisenberg's uncertainty relation

Question # 15 (One answer) The expression (Z2/A)/(Z2/A)crit is used in calculatingg

    A) the half-life for a-decay
    B) the multipole moment for g-transitions
    C) the fissibility parameter
    D) the critical size of atoms
    E) the force between unpaired nucleons

Question # 16 (One or more answers) The energy of a nucleus in its ground state can be regarded as a sum of two or more of the following energy terms;

    A) the energy according to the liquid drop model
    B) the excitation energy
    C) the pairing correction
    D) the shell correction
    E) the nuclear magnetic energy

In case of an error in the answers above, please click on this button before making any corrections 

Question # 17 (One answer) The is a set of rules which can be used to estimate the half-life for b-decay. They are called

    A) the Gamov-Teller selection rules
    B) the Teller correlation matrix
    C) the Gurney-Condon principles
    D) Hans Bethe:s rules
    E) the Franck-Condon selection principle

Question # 18 (One answer) The nuclear magnetic moment and the nuclear spin can be measured by using

    A) an atomic beam apparatus
    B) a spindizzy
    C) a mass spectrometer    er
    D) an oscillograph
    E) a nuclear graviton polarizer

Question # 19 (One answer) The neutron exhibits also a magnetic moment because

    A) it is electrically, but not magnetically, uncharged
    B) it carries an extremely small negative electric charge
    C) the internal neutrinos have unpaired spins
    D) it has an uneven internal charge distribution
    E) it has unevenly placed internal magnets

Question # 20 (One answer) The energy of a series of excited rotational levels in a nucleus can be calculated from

    A) the vibrational quantum number
    B) its rotational moment of inertia
    C) the shape of its b-spectrum
    D) the number of lines in an NMR-spectrum
    E) its Nilsson diagram

Correct answers to each question can be obtained by clicking on the corresponding button below


 

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(Updated 2001-08-22)