Question 1

Carbon 14 is produced in the atmosphere principally by

Accepted Answer

A)  photosynthesis. 
B)  cosmic-ray bombardment. 
C)  plants and animals. 
D)  nitrogen bombardment. 
E)  none of these 
A)  photosynthesis. 
B)  cosmic-ray bombardment. 
C)  plants and animals. 
D)  nitrogen bombardment. 
E)  none of these

Question 2

In a mass spectrometer, a variety of singly-ionized atomic nuclei are directed into a magnetic field where they are deflected and strike a detecting screen. The particles to undergo the greatest
Deflection are the particles with the

Accepted Answer

A)  least mass. 
B)  greatest mass. 
C)  same for all 
A)  least mass. 
B)  greatest mass. 
C)  same for all

Question 3

When an alpha particle is ejected from a nucleus, the nucleus then has less

Accepted Answer

A)  charge. 
B)  mass. 
C)  both of these 
D)  neither of these 
A)  charge. 
B)  mass. 
C)  both of these 
D)  neither of these

Question 4

The half-life on an isotope is one day. At the end of three days, how much of the isotope remains?

Accepted Answer

A)  none 
B)  one-quarter 
C)  one-eighth 
D)  one-half 
E)  none of these 
A)  none 
B)  one-quarter 
C)  one-eighth 
D)  one-half 
E)  none of these

Question 5

The origin of cosmic rays is the

Accepted Answer

A)  clouds. 
B)  cosmos. 
C)  sun. 
D)  Earth. 
E)  none of these 
A)  clouds. 
B)  cosmos. 
C)  sun. 
D)  Earth. 
E)  none of these

Question 6

The atomic mass number of an element is the same as the number of its

Accepted Answer

A)  protons. 
B)  nucleons. 
C)  neutrons. 
D)  none of these 
A)  protons. 
B)  nucleons. 
C)  neutrons. 
D)  none of these

Question 7

Plutonium is not found in any appreciable amounts in natural ore deposits because it

Accepted Answer

A)  is artificially created. 
B)  has a short half life. 
C)  is a gas at room temperature. 
D)  is chemically inert. 
E)  none of these 
A)  is artificially created. 
B)  has a short half life. 
C)  is a gas at room temperature. 
D)  is chemically inert. 
E)  none of these

Question 8

Which radiation has no electric charge associated with it?

Accepted Answer

A)  gamma rays 
B)  beta rays 
C)  alpha rays 
D)  all of these 
E)  none of these 
A)  gamma rays 
B)  beta rays 
C)  alpha rays 
D)  all of these 
E)  none of these

Question 9

A certain radioactive isotope placed near a Geiger counter registers 160 counts per second. Eight hours later, the counter registers 10 counts per second. What is the half life of the isotope?

Accepted Answer

A)  4 hours 
B)  6 hours 
C)  8 hours 
D)  2 hours 
E)  none of these 
A)  4 hours 
B)  6 hours 
C)  8 hours 
D)  2 hours 
E)  none of these

Question 10

Which element has the smaller critical mass; U-235 that releases 2.5 neutrons per fission, or Pu-239 that releases 2.7 neutrons per fission?

Accepted Answer

A)  U-235 
B)  Pu-239 
C)  Both would have the same critical mass. 
A)  U-235 
B)  Pu-239 
C)  Both would have the same critical mass.

Question 11

When thorium (A = 90) emits a beta particle, the resulting nucleus has atomic number

Accepted Answer

A)  88. 
B)  92. 
C)  90. 
D)  89. 
E)  none of these 
A)  88. 
B)  92. 
C)  90. 
D)  89. 
E)  none of these

Question 12

A sphere of pure U-235 will explode if it is

Accepted Answer

A)  big enough. 
B)  small enough. 
C)  shaken hard enough. 
D)  hot enough. 
A)  big enough. 
B)  small enough. 
C)  shaken hard enough. 
D)  hot enough.

Question 13

Fusing two iron nuclei yields a net

Accepted Answer

A)  release of energy. 
B)  absorption of energy. 
C)  neither absorption nor release of energy 
A)  release of energy. 
B)  absorption of energy. 
C)  neither absorption nor release of energy

Question 14

A Geiger counter placed 1 meter from a point source of radiation registers 100 counts per second. If the Geiger counter is moved closer - to 0.5 meter from the source, what will the count rate be?

Accepted Answer

A)  200 counts/s 
B)  100 counts/s 
C)  400 counts/s 
D)  25 counts/s 
E)  50 counts/s 
A)  200 counts/s 
B)  100 counts/s 
C)  400 counts/s 
D)  25 counts/s 
E)  50 counts/s

Question 15

The nucleus with the most tightly bound nucleons is

Accepted Answer

A)  uranium. 
B)  plutonium. 
C)  hydrogen. 
D)  lead. 
E)  iron. 
A)  uranium. 
B)  plutonium. 
C)  hydrogen. 
D)  lead. 
E)  iron.

Question 16

When a beta particle is ejected from a nucleus, the nucleus then has a greater

Accepted Answer

A)  charge. 
B)  mass. 
C)  both of these 
D)  neither of these 
A)  charge. 
B)  mass. 
C)  both of these 
D)  neither of these

Question 17

Which of the following isotopes is radioactive?

Accepted Answer

A)  Carbon-14 
B)  Carbon-12 
C)  Both are radioactive. 
D)  Neither is radioactive in nature. 
A)  Carbon-14 
B)  Carbon-12 
C)  Both are radioactive. 
D)  Neither is radioactive in nature.

Question 18

The fusion torch is a version of

Accepted Answer

A)  a mass spectrometer. 
B)  a cyclotron. 
C)  an electron microscope. 
D)  a hydrogen magnet. 
E)  a linear accelerator. 
A)  a mass spectrometer. 
B)  a cyclotron. 
C)  an electron microscope. 
D)  a hydrogen magnet. 
E)  a linear accelerator.

Question 19

The mass of a nucleus is exactly equal to the sum of the masses of its individual

Accepted Answer

A)  separated neutrons. 
B)  separated nucleons. 
C)  separated protons. 
D)  all of these 
E)  none of these 
A)  separated neutrons. 
B)  separated nucleons. 
C)  separated protons. 
D)  all of these 
E)  none of these

Question 20

Control is exercised in a nuclear reactor by

Accepted Answer

A)  emitting fast neutrons with a moderator. 
B)  absorbing excess neutrons with control rods. 
C)  both of these 
D)  none of these 
A)  emitting fast neutrons with a moderator. 
B)  absorbing excess neutrons with control rods. 
C)  both of these 
D)  none of these

Carbon 14 is produced in the atmosphere principally by

In a mass spectrometer, a variety of singly-ionized atomic nuclei are directed into a magnetic field where they are deflected and strike a detecting screen. The particles to undergo the greatest Deflection are the particles with the

When an alpha particle is ejected from a nucleus, the nucleus then has less

The half-life on an isotope is one day. At the end of three days, how much of the isotope remains?

The origin of cosmic rays is the

The atomic mass number of an element is the same as the number of its

Plutonium is not found in any appreciable amounts in natural ore deposits because it

Which radiation has no electric charge associated with it?

A certain radioactive isotope placed near a Geiger counter registers 160 counts per second. Eight hours later, the counter registers 10 counts per second. What is the half life of the isotope?

Which element has the smaller critical mass; U-235 that releases 2.5 neutrons per fission, or Pu-239 that releases 2.7 neutrons per fission?

When thorium (A = 90) emits a beta particle, the resulting nucleus has atomic number

A sphere of pure U-235 will explode if it is

Fusing two iron nuclei yields a net

A Geiger counter placed 1 meter from a point source of radiation registers 100 counts per second. If the Geiger counter is moved closer - to 0.5 meter from the source, what will the count rate be?

The nucleus with the most tightly bound nucleons is

When a beta particle is ejected from a nucleus, the nucleus then has a greater

Which of the following isotopes is radioactive?

The fusion torch is a version of

The mass of a nucleus is exactly equal to the sum of the masses of its individual

Control is exercised in a nuclear reactor by

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Exam 16: The Atomic Nucleus and Radioactivity

Carbon 14 is produced in the atmosphere principally by

In a mass spectrometer, a variety of singly-ionized atomic nuclei are directed into a magnetic field where they are deflected and strike a detecting screen. The particles to undergo the greatest Deflection are the particles with the

When an alpha particle is ejected from a nucleus, the nucleus then has less

The half-life on an isotope is one day. At the end of three days, how much of the isotope remains?

The origin of cosmic rays is the

The atomic mass number of an element is the same as the number of its

Plutonium is not found in any appreciable amounts in natural ore deposits because it

Which radiation has no electric charge associated with it?

A certain radioactive isotope placed near a Geiger counter registers 160 counts per second. Eight hours later, the counter registers 10 counts per second. What is the half life of the isotope?

Which element has the smaller critical mass; U-235 that releases 2.5 neutrons per fission, or Pu-239 that releases 2.7 neutrons per fission?

When thorium (A = 90) emits a beta particle, the resulting nucleus has atomic number

A sphere of pure U-235 will explode if it is

Fusing two iron nuclei yields a net

A Geiger counter placed 1 meter from a point source of radiation registers 100 counts per second. If the Geiger counter is moved closer - to 0.5 meter from the source, what will the count rate be?

The nucleus with the most tightly bound nucleons is

When a beta particle is ejected from a nucleus, the nucleus then has a greater

Which of the following isotopes is radioactive?

The fusion torch is a version of

The mass of a nucleus is exactly equal to the sum of the masses of its individual

Control is exercised in a nuclear reactor by

About Science

Atoms

Equilibrium and Linear Motion

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Temperature, Heat, and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light Waves

Properties of Light

Quantum Theory

Physics of Rotation and Equilibrium

Filters