Self-test # 3

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Radiochemistry and Nuclear Chemistry self-test # 3

Comprises Chapter 3

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 (Yes/No) Merging of two lighter nuclei to one heavier (fusion) always releases nuclear energy

A) Yes
B) No

Question # 2 (One answer) What kind of stable nuclei are most common? In the list of choices, the condition for neutrons is given first followed by the condition for protons.

A) odd-odd
B) odd-even
C) even-odd
D) even-even

Question # 3 (One answer) How many different nuclides are there who do not show any sign of radioactive decay?

A) 142
B) 275
C) 368
D) 3400
E) 6200

Question # 4 (One answer) The binding energy per nucleon in nuclei having mass numbers between 20 and 250 is

A) 10-20 eV/amu
B) about 931.5 MeV
C) 6-9 kJ/mole
D) 7.4-8.8 MeV/u
E) 33 MWd/kg

Question # 5 (One answer) How many protons or neutrons can at most occupy the same nucleon orbital?

A) 1
B) 2
C) 3
D) 4
E) 5

Question # 6 (One answer) A neutron-rich nuclide may in general be unstable with regard to radioactive decay via

A) emission of a-particles
B) emission of b^--particles
C) emission of b⁺-particles
D) emission of g-rays
E) electron capture

Question # 7 (One or more answers) There are two elements lighter than Bi who lack stable isotopes. They are

A) U
B) Pm
C) Nd
D) Tc
E) Ac

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

Question # 8 (One answer) A line connecting nuclides with the same mass number is called an

A) isotone line
B) ionic line
C) isobar line
D) isomer line
E) isotope line

Question # 9 (One answer) The nuclear charge which corresponds to the lowest energy at a given mass number can be estimated from an equation. Which of the following equations is that?

A) Z = mc²
B) Z = r_oA^1/3
C) Z = a(1 - e^-bt) + e^-bt
D) Z = 2A/[4 + (a_c/a_a)A^2/3]
E) Z = A - NM_n

Question # 10 (One answer) How many isobar parabolas are there for nuclides with even mass numbers?

A) 1
B) 2
C) 3
D) 4
E) none

Question # 11 (One answer) There is also another name for the binding energy equation derived from the liquid drop model. What is it?

A) Einstein's equation
B) Bethe-Weizsäcker's mass formula
C) Schrödiner's equation
D) Dirac's mass equation
E) The actinide hypothesis

Question # 12 (One answer) The ratio between protons and neutrons in the most stable nuclei at a given mass number is 1

A) for the heaviest elements
B) in all nuclides
C) for nuclides near magic numbers
D) for the lightest nuclei
E) in all odd-odd nuclides

Question # 13 (One or more answers) Which of the following values correspond to magic numbers

A) 2
B) 8
C) 20
D) 26
E) 50

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

Question # 14 (One answer) The nuclear radius

A) is constant (=1.4 fm)
B) is proportional to the square root of the mass number
C) is proportional to the cube root of the mass number
D) is directly proportional to the mass number
E) is decreasing with increasing mass number due to the nucleon contraction

Question # 15 (One answer) At which of the following mass numbers do the nuclides have the largest binding energy per nucleon?

A) around 2
B) around 60
C) around 126
D) around 250
E) > 3000

Question # 16 (Yes/No) Does fission of ⁵⁹Fe release nuclear energy?

A) Yes
B) No

Question # 17 (One answer) What is the name of the term in the semiempirical mass equation which changes sign when the considered nuclide is of the odd-odd or even-even type?

A) Asymmetry energy
B) Coulomb energy
C) Surface energy
D) Volume energy
E) Odd-even effect

Question # 18 (One or more answers) How much energy corresponds to one atomic mass unit?

A) 6.022x10²³ eV
B) 4.15x10^-17 kWh
C) 1.602x10^-19 J
D) 931.5 MeV
E) 23.05 kcal/mol

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

Question # 19 (One answer) How is mass excess, d, defined in the book?

A) d = M_A- A
B) d = N/Z - N_A
C) d = M_A- (ZM_H+ NM_n)
D) d = E_B/A - 931.5
E) d = mc²

Question # 20 (One answer) Where are nuclei, which in their ground state are unstable with regard to b^--decay, positioned relative to the most stable nuclide in an isobar cut through the valley of stability at an odd mass number?

A) To the left
B) To the right
C) Straight above
D) Straight below
E) On a higher isobar cut

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

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(Updated 2001-08-18)