# Atoms And Nuclei Quiz B

20 Questions  Settings  This quiz is multiple choice which tests the participants’ conceptual knowledge about the topic 'Atoms and Nuclei'. The questions involve knowledge from four main sections including; The Structure of the Atom, The Structure of the Nucleus, Radioactivity and Nucleur Fission and Fusion.

Related Topics
• 1.
Planck's constant has a value of
• A.

6.626 × 10^-34

• B.

1.055 × 10^34

• C.

8.988 × 10^-16

• D.

8.85 × 10^26

• 2.
A photon is a particle that
• A.

Cannot travel in a vacuum.

• B.

Has zero electric charge.

• C.

Has zero electric field associated with it.

• D.

Has a velocity in a vacuum that varies with the photon frequency.

• 3.
What is the ionization energy of the neutral hydrogen atom?
• A.

6.8 eV

• B.

13.6 eV

• C.

27.2 eV

• D.

• 4.
The wavelength of a ruby laser is 694.3 nm.  What is the energy difference between the two energy states involved in laseraction?
• A.

1.812 eV

• B.

1.646 eV

• C.

1.537 eV

• D.

1.786 eV

• 5.
An atom's atomic number is determined by the number of
• A.

Neutrons in its nucleus.

• B.

Alpha particles in its nucleus.

• C.

Protons in its nucleus.

• D.

Nucleons in its nucleus.

• 6.
If an atom's atomic number is given by Z, its atomic mass by A, and its neutron number by N, which of the following is correct?
• A.

N = Z - A

• B.

N = A - Z

• C.

N = A + Z

• D.

• 7.
There is a limit to the size of a stable nucleus because of
• A.

The limited range of the strong nuclear force.

• B.

The weakness of the gravitational force.

• C.

The weakness of the electrostatic force.

• D.

• 8.
When nucleons join to form a stable nucleus, energy is
• A.

Absorbed.

• B.

Not transferred.

• C.

Destroyed.

• D.

Released.

• 9.
The binding energy per nucleon
• A.

Decreases steadily as we go to heavier elements.

• B.

Has a maximum near iron in the periodic table.

• C.

Is approximately constant throughout the periodic table, except for very light nuclei.

• D.

Increases steadily as we go to heavier elements.

• 10.
An alpha particle will be attracted to a
• A.

Proton.

• B.

Gamma ray.

• C.

Positive charge.

• D.

Negative charge.

• 11.
When a gamma ray is emitted from an unstable nucleus,
• A.

The number of neutrons drops by one and the number of protons increases by one.

• B.

There is no change in either the number of neutrons or the number of protons.

• C.

The number of neutrons and the number of protons drop by two.

• D.

• 12.
The atomic number and mass number for calcium 39 are 20 and 39, respectively.  How many protons are in one atom?
• A.

20

• B.

39

• C.

1

• D.

19

• 13.
If 4.0 × 1018 atoms decay with a half-life of 2.3 years, how many are remaining after 3.7 years?
• A.

1.1 ×1018

• B.

1.3 × 1018

• C.

2.5 × 1018

• D.

1.7 × 1018

• 14.
In a nuclear reaction, what value is conserved in addition to electric charge, energy, and momentum?
• A.

Atomic number

• B.

Nucleon number

• C.

Neutron number

• D.

• 15.
A nuclear reaction is said to be exothermic if the total kinetic energy is
• A.

Zero after the reaction.

• B.

Equal both before and after the reaction

• C.

Less after the reaction than before.

• D.

. greater after the reaction than before.

• 16.
The fuel for nuclear fission is
• A.

He.

• B.

U.

• C.

H.

• D.

• 17.
What is the meaning of the term "critical mass"?
• A.

This refers to the minimum amount of fissionable material required to sustain a chain reaction.

• B.

This refers to the mass of the "critical" elements in a reactor, i.e., the uranium or plutonium.

• C.

This is the material which is just on the verge of becoming radioactive.

• D.

This is the amount of mass needed to make a power reactor economically feasible.

• 18.
What is necessary to stop beta particles?
• A.

Metal foil

• B.

Air alone

• C.

Paper

• D.

Thick metal

• 19.
The fission reaction 235U + 1n → 141Ba + 92Kr + neutrons, the number of neutrons produced is
• A.

1

• B.

Zero

• C.

3

• D.

2

• 20.
What is the energy released (positive) or absorbed (negative) in the following reaction?  3H (3.016049)  +   3H  (3.016049)    =   4He (4.002603)   +    2(1n) (1.008665)
• A.

0.0122 MeV

• B.

-11.3 MeV

• C.

-0.0122 MeV

• D.

11.3 MeV