Question 1

Tell why each nuclide shown is unstable. Explain your reasoning in each case.

Accepted Answer

33Cl has fewer neutrons than p

Question 2

The percentage of a radionuclide that would remain after 4 half-lives is ______________.

Accepted Answer

The answer of The percentage of a radionuclide that would...

Question 3

In nuclear fusion,

Accepted Answer

A)  light nuclei combine to form a heavier nucleus. 
B)  a large nucleus splits into two smaller ones. 
C)  an initial reaction triggers a chain reaction. 
D)  protons are converted into neutrons and energy. 
A)  light nuclei combine to form a heavier nucleus. 
B)  a large nucleus splits into two smaller ones. 
C)  an initial reaction triggers a chain reaction. 
D)  protons are converted into neutrons and energy.

Question 4

The "splitting" of the atom was first discovered in

Accepted Answer

A)  1952. 
B)  1869. 
C)  1938. 
D)  1905. 
A)  1952. 
B)  1869. 
C)  1938. 
D)  1905.

Question 5

The number of neutrons available to cause fission in a nuclear reactor is adjusted by inserting or withdrawing the ______________.

Accepted Answer

The answer of The number of neutrons available to cause...

Question 6

With only two exceptions, if a nucleus contains fewer ______________ than ______________, it is unstable.

Accepted Answer

A)  protons; neutrons 
B)  neutrons; protons 
C)  protons; alpha particles 
D)  protons; beta particles 
A)  protons; neutrons 
B)  neutrons; protons 
C)  protons; alpha particles 
D)  protons; beta particles

Question 7

The mass number (A) of a nuclide is equal to the number of ______________ in one of its nuclei.

Accepted Answer

A)  protons plus neutrons 
B)  protons 
C)  neutrons 
D)  neutrons plus electrons 
A)  protons plus neutrons 
B)  protons 
C)  neutrons 
D)  neutrons plus electrons

Question 8

Determine the atomic mass of a hypothetical element that occurs on Earth as a mixture of 20.00% 32X (atomic mass of isotope = 32.00 u) and 80.00% 34X (atomic mass of isotope = 34.00 u).

Accepted Answer

Question 9

Which of the following instruments detects and measures radioactivity?

Accepted Answer

A)  Geiger counter 
B)  Cyclotron 
C)  Tokamak 
D)  Mass spectrometer 
A)  Geiger counter 
B)  Cyclotron 
C)  Tokamak 
D)  Mass spectrometer

Question 10

Thermonuclear warheads, or hydrogen bombs, are powerful mainly because of the

Accepted Answer

A)  fission process. 
B)  fusion process. 
C)  absorption of neutrons by 238U. 
D)  emission of protons by 238U. 
A)  fission process. 
B)  fusion process. 
C)  absorption of neutrons by 238U. 
D)  emission of protons by 238U.

Question 11

If a radionuclide has a half-life of 8 h, ______________ half-lives would go by during 40 h.

Accepted Answer

The answer of If a radionuclide has a half-life of...

Question 12

The reaction   is an example of

Accepted Answer

A)  fission. 
B)  alpha emission. 
C)  naturally occurring neutron decay. 
D)  fusion. 
A)  fission. 
B)  alpha emission. 
C)  naturally occurring neutron decay. 
D)  fusion.

Question 13

When   decays to   , a(n) _____________ is emitted.

Accepted Answer

A)  alpha particle 
B)  neutron   
C)  gamma ray 
D)  beta particle 
A)  alpha particle 
B)  neutron   
C)  gamma ray 
D)  beta particle

Question 14

A scientist named ______________ discovered the neutron in 1932.

Accepted Answer

The answer of A scientist named ______________ discovered the neutron...

Question 15

What happens to the atomic number (Z) and the mass number (A) when a nucleus emits an alpha particle?

Accepted Answer

A)  Z increases by 1; A is unchanged. 
B)  Z is unchanged; A is unchanged. 
C)  Z decreases by 2; A decreases by 4. 
D)  Z decreases by 1; A is unchanged. 
A)  Z increases by 1; A is unchanged. 
B)  Z is unchanged; A is unchanged. 
C)  Z decreases by 2; A decreases by 4. 
D)  Z decreases by 1; A is unchanged.

Question 16

What is the symbol for the element Actinium?

Accepted Answer

A)  Ac 
B)  Tl 
C)  B 
D)  Md 
E)  He 
A)  Ac 
B)  Tl 
C)  B 
D)  Md 
E)  He

Question 17

The number of neutrons in a triton is ______________.

Accepted Answer

The answer of The number of neutrons in a triton...

Question 18

How many electrons are there in a neutral atom of   ?

Accepted Answer

A)  26 
B)  30 
C)  82 
D)  56 
A)  26 
B)  30 
C)  82 
D)  56

Question 19

The name of the transuranium element commonly used in smoke detectors is ______________.

Accepted Answer

The answer of The name of the transuranium element commonly...

Question 20

The half-life of 20F is 11 s. What fraction of a sample of 20F will remain after 44 s have elapsed?

Accepted Answer

A)  1/4 
B)  1/16 
C)  1/8 
D)  None of these 
A)  1/4 
B)  1/16 
C)  1/8 
D)  None of these

Exam 10: Nuclear Physics

Tell why each nuclide shown is unstable. Explain your reasoning in each case.

The percentage of a radionuclide that would remain after 4 half-lives is ______________.

In nuclear fusion,

The "splitting" of the atom was first discovered in

The number of neutrons available to cause fission in a nuclear reactor is adjusted by inserting or withdrawing the ______________.

With only two exceptions, if a nucleus contains fewer ______________ than ______________, it is unstable.

The mass number (A) of a nuclide is equal to the number of ______________ in one of its nuclei.

Determine the atomic mass of a hypothetical element that occurs on Earth as a mixture of 20.00% 32X (atomic mass of isotope = 32.00 u) and 80.00% 34X (atomic mass of isotope = 34.00 u).

Which of the following instruments detects and measures radioactivity?

Thermonuclear warheads, or hydrogen bombs, are powerful mainly because of the

If a radionuclide has a half-life of 8 h, ______________ half-lives would go by during 40 h.

The reaction is an example of

When decays to , a(n) _____________ is emitted.

A scientist named ______________ discovered the neutron in 1932.

What happens to the atomic number (Z) and the mass number (A) when a nucleus emits an alpha particle?

What is the symbol for the element Actinium?

The number of neutrons in a triton is ______________.

How many electrons are there in a neutral atom of ?

The name of the transuranium element commonly used in smoke detectors is ______________.

The half-life of 20F is 11 s. What fraction of a sample of 20F will remain after 44 s have elapsed?

Measurement

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Filters

With only two exceptions, if a nucleus contains fewer than , it is unstable.

Determine the atomic mass of a hypothetical element that occurs on Earth as a mixture of 20.00% ³²X (atomic mass of isotope = 32.00 u) and 80.00% ³⁴X (atomic mass of isotope = 34.00 u).

The half-life of ²⁰F is 11 s. What fraction of a sample of ²⁰F will remain after 44 s have elapsed?