Question 1

The rate constant for the decay of a radioactive isootope is 4.226 × 10-3 / day.What is the half-life of of this isotope?

Accepted Answer

A)  328.0 days
B)  410.0 days
C)  82.00 days
D)  164.0 days
E)  none of theseF) None of the above
G) A) and E)

Question 2

Which is the most likely mode of radioactive decay for the radioactive nuclide carbon-14?

Accepted Answer

A)  gamma emission
B)  alpha emission
C)  electron capture
D)  positron emission
E)  beta emissionF) C) and D)
G) A) and B)

Question 3

When the nucleus of an element undergoes beta emission

Accepted Answer

A)  the mass number increases by one.
B)  the mass number decreases by one.
C)  the atomic number decreases by one.
D)  the number of neutrons increases by one.
E)  the atomic number increases by one.F) A) and B)
G) A) and C)

Question 4

55Mn can be prepared by electron capture from which of the following?

Accepted Answer

A)  (56Mn) 
B)  (55Fe) 
C)  (55Cr) 
D)  (51V) 
E)  (57Co) F) None of the above
G) B) and C)

Question 5

For which of the following radioactive decay processes does the atomic number not change?

Accepted Answer

A)  electron capture
B)  positron emission
C)  alpha emission
D)  gamma emission
E)  beta emissionF) A) and B)
G) A) and C)

Question 6

Strontium-90 is produced in nuclear explosions.It can replace calcium in the bone.The half-life of 90Sr is 27.7 years.If the activity of 90Sr in the bones of an exposed person were 90 disintegrations per second,how long would it take the activity of 90Sr to decrease to 8.1 disintegrations per second?

Accepted Answer

A)  96 years
B)  66 years
C)  49 years
D)  59 years
E)  75 yearsF) C) and D)
G) A) and E)

Question 7

A scintillation counter measures radiation by detecting

Accepted Answer

A)  cations produced from radiation colliding with phosphor gases.
B)  electrons released when gas atoms are ionized by the radiation.
C)  alpha and beta particles as they strike a detector window.
D)  the increase in temperature when a gas is struck by radiation.
E)  flashes of light emitted from a phosphor affected by radiation.F) B) and E)
G) All of the above

Question 8

The radioactive nuclide,22Na,undergoes decay by emitting a positron.What is the nuclear composition of the product nuclide?

Accepted Answer

A)  12 protons and 10 neutrons
B)  11 protons and 11 neutrons
C)  11 protons and 10 neutrons
D)  9 protons and 12 neutrons
E)  10 protons and 12 neutronsF) B) and D)
G) B) and C)

Question 9

Which of the following radioactive isotopes is not commonly used in medical applications?

Accepted Answer

A)  technetium-99m
B)  iodine-131
C)  strontium-90
D)  cobalt-60
E)  thallium-201F) A) and B)
G) A) and C)

Question 10

Which particle does the nuclide symbol  represent?

Accepted Answer

A)  positron
B)  helium nucleus
C)  electron
D)  proton
E)  gamma photonF) B) and E)
G) A) and C)

Exam 20: Nuclear Chemistry

The rate constant for the decay of a radioactive isootope is 4.226 × 10^-3 / day.What is the half-life of of this isotope?

Correct Answer
verified

When the nucleus of an element undergoes beta emission

Correct Answer
verified

A scintillation counter measures radiation by detecting

Correct Answer
verified

Which particle does the nuclide symbol represent?

Correct Answer
verified

Correct Answer
verified

For which of the following radioactive decay processes does the atomic number not change?

Correct Answer
verified

Which of the following radioactive isotopes is not commonly used in medical applications?

Correct Answer
verified

Which is the most likely mode of radioactive decay for the radioactive nuclide carbon-14?

Correct Answer
verified

The radioactive nuclide,²²Na,undergoes decay by emitting a positron.What is the nuclear composition of the product nuclide?

Correct Answer
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⁵⁵Mn can be prepared by electron capture from which of the following?

Correct Answer
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Exam 20: Nuclear Chemistry

The rate constant for the decay of a radioactive isootope is 4.226 × 10-3 / day.What is the half-life of of this isotope?

Correct AnswerverifiedShow Answer

When the nucleus of an element undergoes beta emission

Correct AnswerverifiedShow Answer

A scintillation counter measures radiation by detecting

Correct AnswerverifiedShow Answer

Which particle does the nuclide symbol represent?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

For which of the following radioactive decay processes does the atomic number not change?

Correct AnswerverifiedShow Answer

Which of the following radioactive isotopes is not commonly used in medical applications?

Correct AnswerverifiedShow Answer

Which is the most likely mode of radioactive decay for the radioactive nuclide carbon-14?

Correct AnswerverifiedShow Answer

The radioactive nuclide,22Na,undergoes decay by emitting a positron.What is the nuclear composition of the product nuclide?

Correct AnswerverifiedShow Answer

55Mn can be prepared by electron capture from which of the following?

Correct AnswerverifiedShow Answer

The rate constant for the decay of a radioactive isootope is 4.226 × 10^-3 / day.What is the half-life of of this isotope?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The radioactive nuclide,²²Na,undergoes decay by emitting a positron.What is the nuclear composition of the product nuclide?

Correct Answer
verified

⁵⁵Mn can be prepared by electron capture from which of the following?

Correct Answer
verified