Question 1

What are isobaric nuclides?

Accepted Answer

A) nuclei of the same element with different numbers of neutrons 
B) nuclei of different elements with the same number of nucleons 
C) nuclei of the same element with different numbers of protons 
D) nuclei of different elements with the same number of protons 
A) nuclei of the same element with different numbers of neutrons 
B) nuclei of different elements with the same number of nucleons 
C) nuclei of the same element with different numbers of protons 
D) nuclei of different elements with the same number of protons

Question 2

What is the atomic number of an atomic nucleus equal to?

Accepted Answer

A) the number of protons 
B) the number of neutrons 
C) the number of protons and neutrons 
D) the number of electrons 
A) the number of protons 
B) the number of neutrons 
C) the number of protons and neutrons 
D) the number of electrons

Question 3

The transition energy between two states of a spin-   /2 nucleus in an external magnetic field is comparable to the Balmer series of electron transitions between energy states in the atom.

Accepted Answer

A) True 
 B)False

Question 4

Which of these particles is a beta particle?

Accepted Answer

A) high energy photon 
B) positron 
C) helium atom 
D) helium nucleus 
A) high energy photon 
B) positron 
C) helium atom 
D) helium nucleus

Question 5

What is the maximal kinetic energy of an electron (â-particle) in the decay of sodium into magnesium?
[Note:       + e- + v.]

Accepted Answer

5.5 MeV
RA

Question 6

Isotopic nuclides are nuclides with the same atomic number.

Accepted Answer

A) True 
 B)False

Question 7

What are the constituents of the atomic nucleus?

Accepted Answer

A) protons and neutrons 
B) protons and electrons 
C) photons and neutrons 
D) positrons and neutrinos 
A) protons and neutrons 
B) protons and electrons 
C) photons and neutrons 
D) positrons and neutrinos

Question 8

Which of these changes occurs in the nucleus during beta decay?

Accepted Answer

A) The mass number decreases by 4, and the atomic number decreases by 2. 
B) The mass number does not change, but the atomic number changes. 
C) The mass number changes, but the atomic number does not change. 
D) Neither the mass number nor the atomic number changes. 
A) The mass number decreases by 4, and the atomic number decreases by 2. 
B) The mass number does not change, but the atomic number changes. 
C) The mass number changes, but the atomic number does not change. 
D) Neither the mass number nor the atomic number changes.

Question 9

The radioactive gas radon has a half-life of 3.8 days. How long will it take for the radon in a basement to decay to 50% of its present level?

Accepted Answer

A) 1.9 days 
B) 3.8 days 
C) 7.6 days 
D) 16.4 days 
A) 1.9 days 
B) 3.8 days 
C) 7.6 days 
D) 16.4 days

Question 10

A decay of   into   is an example of what type of a decay? What particle is released in the process?

Accepted Answer

alpha decay, alpha particle (2

Question 11

An isomer decays by emitting a gamma photon.

Accepted Answer

A) True 
 B)False

Question 12

Nuclear force, like the electric force, acts only on charged particles. Neutrons are not affected by nuclear force.

Accepted Answer

A) True 
 B)False

Question 13

The half-life is half the time needed for a radioactive sample to completely decay.

Accepted Answer

A) True 
 B)False

Question 14

Which of these changes occurs in the nucleus during an alpha decay?

Accepted Answer

A) The mass number decreases by 4, and the atomic number decreases by 2. 
B) The mass number does not change, but the atomic number changes. 
C) The mass number changes, but the atomic number does not change. 
D) Neither the mass number nor the atomic number changes. 
A) The mass number decreases by 4, and the atomic number decreases by 2. 
B) The mass number does not change, but the atomic number changes. 
C) The mass number changes, but the atomic number does not change. 
D) Neither the mass number nor the atomic number changes.

Question 15

Which statement accurately describes the binding energy of a nucleus?

Accepted Answer

A) It is the difference between the masses of separated nucleons and the mass of a nucleus, converted into energy. 
B) It is the energy required for a nucleus to bond nucleons. 
C) It is equal to the mass of nucleons when converted into energy. 
D) It is the difference between the mass of the atom and the mass of the electrons, converted into energy. 
A) It is the difference between the masses of separated nucleons and the mass of a nucleus, converted into energy. 
B) It is the energy required for a nucleus to bond nucleons. 
C) It is equal to the mass of nucleons when converted into energy. 
D) It is the difference between the mass of the atom and the mass of the electrons, converted into energy.

Question 16

The activity of a radioactive sample is a positive or negative value of the decay rate, depending on the radioactive sample.

Accepted Answer

A) True 
 B)False

Question 17

Initially there are 6000 nuclei of an isotope with a half-life of 3 hours. How many nuclei of that isotope will be left after 12 hours?

Accepted Answer

A) 375 
B) 750 
C) 1500 
D) 3000 
A) 375 
B) 750 
C) 1500 
D) 3000

Question 18

Current loops act as magnetic dipoles.

Accepted Answer

A) True 
 B)False

Question 19

Calculate the energy released in the process of decay of   into   [Note: 1 u = 931.5 MeV/c2.]

Accepted Answer

E = 0.156 MeV
RAT: @#IMG-DLM&

Question 20

Which of these particles is emitted in gamma decay?

Accepted Answer

A) high energy photon 
B) positron 
C) helium atom 
D) helium nucleus 
A) high energy photon 
B) positron 
C) helium atom 
D) helium nucleus

Exam 22: The Atomic Nucleus

What are isobaric nuclides?

What is the atomic number of an atomic nucleus equal to?

The transition energy between two states of a spin- /2 nucleus in an external magnetic field is comparable to the Balmer series of electron transitions between energy states in the atom.

Which of these particles is a beta particle?

What is the maximal kinetic energy of an electron (â-particle) in the decay of sodium into magnesium? [Note: + e- + v.]

Isotopic nuclides are nuclides with the same atomic number.

What are the constituents of the atomic nucleus?

Which of these changes occurs in the nucleus during beta decay?

The radioactive gas radon has a half-life of 3.8 days. How long will it take for the radon in a basement to decay to 50% of its present level?

A decay of into is an example of what type of a decay? What particle is released in the process?

An isomer decays by emitting a gamma photon.

Nuclear force, like the electric force, acts only on charged particles. Neutrons are not affected by nuclear force.

The half-life is half the time needed for a radioactive sample to completely decay.

Which of these changes occurs in the nucleus during an alpha decay?

Which statement accurately describes the binding energy of a nucleus?

The activity of a radioactive sample is a positive or negative value of the decay rate, depending on the radioactive sample.

Initially there are 6000 nuclei of an isotope with a half-life of 3 hours. How many nuclei of that isotope will be left after 12 hours?

Current loops act as magnetic dipoles.

Calculate the energy released in the process of decay of into [Note: 1 u = 931.5 MeV/c2.]

Which of these particles is emitted in gamma decay?

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Filters

What is the maximal kinetic energy of an electron (â-particle) in the decay of sodium into magnesium? [Note: + e^- + v.]

Calculate the energy released in the process of decay of into [Note: 1 u = 931.5 MeV/c².]