Question 1

In the nuclear reaction  , what is X?

Accepted Answer

A) (12
C)  
B) (13
C)  
C) (14
C)  
D) (15
C)  
E) (17O) 
A) (12
C)  
B) (13
C)  
C) (14
C)  
D) (15
C)  
E) (17O) B

Question 2

The carbon in our bodies was formed in nuclear reactions in long-dead stars.How much energy was released when the right number of 4He nuclei combined to make 12C? The mass of 4He is 3728.40 MeV/c2 and the mass of 12C is 11,177.93 MeV/c2.

Accepted Answer

A) 7.27 MeV 
B) 372 MeV 
C) 8.42 MeV 
D) 2.11 MeV 
A) 7.27 MeV 
B) 372 MeV 
C) 8.42 MeV 
D) 2.11 MeV A

Question 3

When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions.One such reaction is  
The following mass values are known: 
 
What mass of uranium is needed to produce a 10-kiloton yield? (1 u = 931.5 MeV/c2 = 1.66054 × 10-27 kg,1-kiloton yield = 5.0 × 1012 J)

Accepted Answer

A) 0.57 kg 
B) 0.66 kg 
C) 6.58 kg 
D) 3.85 kg 
E) 1.10 kg 
A) 0.57 kg 
B) 0.66 kg 
C) 6.58 kg 
D) 3.85 kg 
E) 1.10 kg B

Question 4

The half-life of a radioactive material is 4.5 days.How many days are required for a sample,with an initial activity of 1.0 × 105 Bq,to decay to an activity of 100 Bq?

Accepted Answer

A) 45 days 
B) 36 days 
C) 54 days 
D) 31 days 
A) 45 days 
B) 36 days 
C) 54 days 
D) 31 days

Question 5

An α particle is also known as

Accepted Answer

A) an electron. 
B) a positron. 
C) a helium nucleus. 
D) a high-energy photon. 
A) an electron. 
B) a positron. 
C) a helium nucleus. 
D) a high-energy photon.

Question 6

In the nuclear reaction  ,what is X?

Accepted Answer

A) proton 
B) neutron 
C) (2H) 
D) (3H) 
E) alpha particle 
A) proton 
B) neutron 
C) (2H) 
D) (3H) 
E) alpha particle

Question 7

One of the fusion reactions that occurs in the sun is:  
He +  
He →  
He +  
H +  
H
The following atomic masses are known:  
H: 1.007825 u  
He: 3.016029 u  
He: 4.002603 u
What is the reaction energy released in this fusion reaction? (1 u = 931.5 MeV/c2)

Accepted Answer

A) 11 MeV 
B) 13 MeV 
C) 15 MeV 
D) 17 MeV 
E) 19 MeV 
A) 11 MeV 
B) 13 MeV 
C) 15 MeV 
D) 17 MeV 
E) 19 MeV

Question 8

Suppose the half-life of an isotope is 2 days.You purchase 10 grams of the isotope,but it was produced in a laboratory 4 days before it was delivered to you.How much of this isotope will you have 3 days after it was delivered to you?

Accepted Answer

A) more than 2.5 grams but less than 5 grams 
B) 2.5 grams 
C) more than 1.25 grams but less than 2.5 grams 
D) 1.25 grams 
E) less than 1.25 grams 
A) more than 2.5 grams but less than 5 grams 
B) 2.5 grams 
C) more than 1.25 grams but less than 2.5 grams 
D) 1.25 grams 
E) less than 1.25 grams

Question 9

One material used in nuclear bombs is 239Pu,with a half-life of 24,000 years.How long must we wait for a buried stockpile of this substance to decay to 1/1000 of its original activity?

Accepted Answer

A) 1,200,000 years 
B) 240,000 years 
C) 150,000 years 
D) 82,000 years 
E) 1,500 years 
A) 1,200,000 years 
B) 240,000 years 
C) 150,000 years 
D) 82,000 years 
E) 1,500 years

Question 10

The neutral deuterium atom,  
H,has a mass of 2.014102 u;a neutral ordinary hydrogen atom has a mass of 1.007825 u;a neutron has a mass of 1.008665 u;and a proton has a mass of 1.007277 u.What is the binding energy of the deuterium nucleus? (1 u = 931.5 MeV/c2)

Accepted Answer

A) 1.1 MeV 
B) 1.7 MeV 
C) 2.2 MeV 
D) 2.9 MeV 
E) 3.4 MeV 
A) 1.1 MeV 
B) 1.7 MeV 
C) 2.2 MeV 
D) 2.9 MeV 
E) 3.4 MeV

Question 11

What happens to the half-life of a radioactive substance as it decays?

Accepted Answer

A) It remains constant. 
B) It increases. 
C) It decreases at a constant rate. 
D) It decreases at an exponential rate. 
A) It remains constant. 
B) It increases. 
C) It decreases at a constant rate. 
D) It decreases at an exponential rate.

Question 12

How many quarks are in a deuteron,  
H?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 6 
E) 9 
A) 2 
B) 3 
C) 4 
D) 6 
E) 9

Question 13

Which of the following particles (or groups of particles)are made up of quarks?

Accepted Answer

A) protons,neutrons,and electrons 
B) electrons and neutrinos 
C) photons 
D) protons and neutrons 
E) All particles except for photons are made up of quarks. 
A) protons,neutrons,and electrons 
B) electrons and neutrinos 
C) photons 
D) protons and neutrons 
E) All particles except for photons are made up of quarks.

Question 14

The half-life of cobalt-60 is 5.3 years,while that of strontium-90 is about 29 years.Suppose you have samples of both isotopes,and that they initially contain equal numbers of atoms of these isotopes.How will the activities (number of decays per second)of the samples compare?

Accepted Answer

A) The activity of the cobalt-60 sample will be greater. 
B) The activities cannot be compared without more information. 
C) The activities will be equal. 
D) The activity of the strontium-90 sample will be greater. 
A) The activity of the cobalt-60 sample will be greater. 
B) The activities cannot be compared without more information. 
C) The activities will be equal. 
D) The activity of the strontium-90 sample will be greater.

Question 15

A nuclear reaction is shown:  
B +  
He →  
H + ? .Which one of the following isotopes is the missing nuclear product?

Accepted Answer

A)    F 
B)    N 
C)    C 
D)    N 
E)    N 
A)    F 
B)    N 
C)    C 
D)    N 
E)    N

Question 16

When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions.One such reaction is  
The following mass values are known: 
 
How much energy is released in this reaction? (1 u = 931.5 MeV/c2)

Accepted Answer

A) 185 MeV 
B) 202 MeV 
C) 32.6 MeV 
D) 65.7 MeV 
E) 98.6 MeV 
A) 185 MeV 
B) 202 MeV 
C) 32.6 MeV 
D) 65.7 MeV 
E) 98.6 MeV

Question 17

In massive stars,three helium nuclei fuse together,forming a carbon nucleus,and this reaction heats the core of the star.The net mass of the three helium nuclei must therefore be

Accepted Answer

A) higher than that of the carbon nucleus. 
B) less than that of the carbon nucleus. 
C) the same as that of the carbon nucleus because mass is always conserved. 
D) the same as that of the carbon nucleus because energy is always conserved. 
A) higher than that of the carbon nucleus. 
B) less than that of the carbon nucleus. 
C) the same as that of the carbon nucleus because mass is always conserved. 
D) the same as that of the carbon nucleus because energy is always conserved.

Question 18

Inside the nucleus,the weakest of the four fundamental forces is

Accepted Answer

A) the weak nuclear force. 
B) the electromagnetic force. 
C) the gravitational force. 
D) the strong nuclear force. 
A) the weak nuclear force. 
B) the electromagnetic force. 
C) the gravitational force. 
D) the strong nuclear force.

Question 19

A radioactive sample has a half-life of 10 min.What fraction of the sample is left after 40 min?

Accepted Answer

A) 1/2 
B) 1/4 
C) 1/8 
D) 1/16 
A) 1/2 
B) 1/4 
C) 1/8 
D) 1/16

Question 20

When a stationary plutonium-239,  
Pu,decays into uranium-235 plus an alpha particle,the energy released in the process is 5.24 MeV.The following masses are known:  
He: 4.002603 u  
U: 235.043924 u
What is the mass of the  
Pu nucleus,in amu? (1 u = 931.494 MeV/c2)

Accepted Answer

A) 239.05215 u 
B) 239.02775 u 
C) 239.00189 u 
D) 238.99919 u 
E) 238.98884 u 
A) 239.05215 u 
B) 239.02775 u 
C) 239.00189 u 
D) 238.99919 u 
E) 238.98884 u

Exam 32: Nuclear Physics and Nuclear Radiation

In the nuclear reaction , what is X?

The carbon in our bodies was formed in nuclear reactions in long-dead stars.How much energy was released when the right number of 4He nuclei combined to make 12C? The mass of 4He is 3728.40 MeV/c2 and the mass of 12C is 11,177.93 MeV/c2.

When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions.One such reaction is The following mass values are known: What mass of uranium is needed to produce a 10-kiloton yield? (1 u = 931.5 MeV/c2 = 1.66054 × 10-27 kg,1-kiloton yield = 5.0 × 1012 J)

The half-life of a radioactive material is 4.5 days.How many days are required for a sample,with an initial activity of 1.0 × 105 Bq,to decay to an activity of 100 Bq?

An α particle is also known as

In the nuclear reaction ,what is X?

One of the fusion reactions that occurs in the sun is: He + He → He + H + H The following atomic masses are known: H: 1.007825 u He: 3.016029 u He: 4.002603 u What is the reaction energy released in this fusion reaction? (1 u = 931.5 MeV/c2)

Suppose the half-life of an isotope is 2 days.You purchase 10 grams of the isotope,but it was produced in a laboratory 4 days before it was delivered to you.How much of this isotope will you have 3 days after it was delivered to you?

One material used in nuclear bombs is 239Pu,with a half-life of 24,000 years.How long must we wait for a buried stockpile of this substance to decay to 1/1000 of its original activity?

The neutral deuterium atom, H,has a mass of 2.014102 u;a neutral ordinary hydrogen atom has a mass of 1.007825 u;a neutron has a mass of 1.008665 u;and a proton has a mass of 1.007277 u.What is the binding energy of the deuterium nucleus? (1 u = 931.5 MeV/c2)

What happens to the half-life of a radioactive substance as it decays?

How many quarks are in a deuteron, H?

Which of the following particles (or groups of particles)are made up of quarks?

The half-life of cobalt-60 is 5.3 years,while that of strontium-90 is about 29 years.Suppose you have samples of both isotopes,and that they initially contain equal numbers of atoms of these isotopes.How will the activities (number of decays per second)of the samples compare?

A nuclear reaction is shown: B + He → H + ? .Which one of the following isotopes is the missing nuclear product?

When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions.One such reaction is The following mass values are known: How much energy is released in this reaction? (1 u = 931.5 MeV/c2)

In massive stars,three helium nuclei fuse together,forming a carbon nucleus,and this reaction heats the core of the star.The net mass of the three helium nuclei must therefore be

Inside the nucleus,the weakest of the four fundamental forces is

A radioactive sample has a half-life of 10 min.What fraction of the sample is left after 40 min?

When a stationary plutonium-239, Pu,decays into uranium-235 plus an alpha particle,the energy released in the process is 5.24 MeV.The following masses are known: He: 4.002603 u U: 235.043924 u What is the mass of the Pu nucleus,in amu? (1 u = 931.494 MeV/c2)

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The carbon in our bodies was formed in nuclear reactions in long-dead stars.How much energy was released when the right number of ⁴He nuclei combined to make ^{12C? The mass of 4He is 3728.40 MeV/}^c^{2 and the mass of 12C is 11,177.93 MeV/}^c^2.

When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions.One such reaction is The following mass values are known: What mass of uranium is needed to produce a 10-kiloton yield? (1 u = 931.5 MeV/c² = 1.66054 × 10^-27 kg,1-kiloton yield = 5.0 × 10¹² J)

The half-life of a radioactive material is 4.5 days.How many days are required for a sample,with an initial activity of 1.0 × 10⁵ Bq,to decay to an activity of 100 Bq?

One of the fusion reactions that occurs in the sun is: He + He → He + H + H The following atomic masses are known: H: 1.007825 u He: 3.016029 u He: 4.002603 u What is the reaction energy released in this fusion reaction? (1 u = 931.5 MeV/c²)

One material used in nuclear bombs is ²³⁹Pu,with a half-life of 24,000 years.How long must we wait for a buried stockpile of this substance to decay to 1/1000 of its original activity?

The neutral deuterium atom, H,has a mass of 2.014102 u;a neutral ordinary hydrogen atom has a mass of 1.007825 u;a neutron has a mass of 1.008665 u;and a proton has a mass of 1.007277 u.What is the binding energy of the deuterium nucleus? (1 u = 931.5 MeV/c²)

When a neutron collides with a uranium-235 nucleus it can induce a variety of fission reactions.One such reaction is The following mass values are known: How much energy is released in this reaction? (1 u = 931.5 MeV/c²)

When a stationary plutonium-239, Pu,decays into uranium-235 plus an alpha particle,the energy released in the process is 5.24 MeV.The following masses are known: He: 4.002603 u U: 235.043924 u What is the mass of the Pu nucleus,in amu? (1 u = 931.494 MeV/c²)