Question 1

How does the mass of the products of a nuclear fusion reaction compare to the mass of the original elements?

Accepted Answer

A)  The mass of the products is greater than the mass of the original elements. 
B)  The mass of the products is less than the mass of the original elements. 
C)  The mass of the products is equal to the mass of the original elements. 
D)  The mass of the products is unrelated to the mass of the original elements. 
A)  The mass of the products is greater than the mass of the original elements. 
B)  The mass of the products is less than the mass of the original elements. 
C)  The mass of the products is equal to the mass of the original elements. 
D)  The mass of the products is unrelated to the mass of the original elements.

Question 2

Consider the fusion reaction   
H +   
H +   
H →   
He +   
H +   
n
The atomic masses are:   
H: 2.01410 u   
He: 4.00260 u   
H, 1.00783 u   
n: 1.008665 u
What mass of deuterium fuel,   
H, is used up in producing 8.2 × 1013 J of energy by this reaction? (1u = 1.6605 × 10-27 kg = 931.5 MeV/c2)

Accepted Answer

Question 3

The maximum permissible workday dose for occupational exposure to radiation is 26 mrem. A 55-kg laboratory technician absorbs 3.3 mJ of 0.40-MeV gamma rays in a workday. The relative biological efficiency (RBE) for gamma rays is 1.00. What is the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage?

Accepted Answer

A)  0.23 
B)  0.25 
C)  0.28 
D)  0.30 
E)  0.32 
A)  0.23 
B)  0.25 
C)  0.28 
D)  0.30 
E)  0.32

Question 4

Scandium,   Sc, decays by emitting a positron. What is the nuclide that is the product of the decay?

Accepted Answer

A)    Sc 
B)    Sc 
C)    Ca 
D)    Ca 
E)    Sc 
A)    Sc 
B)    Sc 
C)    Ca 
D)    Ca 
E)    Sc

Question 5

Uranium-238 decays into thorium-234 plus an alpha particle. How much energy is released in this process? 1 u = 931.494 MeV/c2, and the relevant mass values are   He: 4.002603 u  
Th: 234.043583 u  
U: 238.050786 u

Accepted Answer

A)  4.28 MeV 
B)  3.76 MeV 
C)  3.18 MeV 
D)  2.89 MeV 
E)  5.05 MeV 
A)  4.28 MeV 
B)  3.76 MeV 
C)  3.18 MeV 
D)  2.89 MeV 
E)  5.05 MeV

Question 6

In the fission reaction   U + neutron →  
Ba +  
Kr + x neutrons, what is the number x of neutrons produced?

Accepted Answer

A)  0 
B)  4 
C)  1 
D)  3 
E)  2 
A)  0 
B)  4 
C)  1 
D)  3 
E)  2

Question 7

Carbon-14 has a half-life of 5730 y. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory, where it is determined that the activity of the sample is 0.144 Bq/g. By comparing this activity with the activity of living organic matter, 0.230 Bq/g, the scientist determines how old the wood sample is, or more precisely, when the tree that the sample came from died. How old is the sample of wood?

Accepted Answer

A)  3870 y 
B)  4250 y 
C)  4590 y 
D)  2630 y 
E)  2940 y 
A)  3870 y 
B)  4250 y 
C)  4590 y 
D)  2630 y 
E)  2940 y

Question 8

A proton strikes an   O nucleus producing  
F and another particle. What is the other particle?

Accepted Answer

A)  a neutron 
B)  an alpha particle 
C)  a β- particle 
D)  a β+ particle 
E)  a gamma ray 
A)  a neutron 
B)  an alpha particle 
C)  a β- particle 
D)  a β+ particle 
E)  a gamma ray

Question 9

A 70-kg laboratory technician absorbs 2.9 mJ of 0.50-MeV gamma rays in a workday. How many gamma-ray photons does the technician absorb in a workday?

Accepted Answer

A)  3.6 × 1010 
B)  3.6 × 109 
C)  3.6 × 108 
D)  1.0 × 109 
E)  1.0 × 108 
A)  3.6 × 1010 
B)  3.6 × 109 
C)  3.6 × 108 
D)  1.0 × 109 
E)  1.0 × 108

Exam 42: Nuclear Physics

How does the mass of the products of a nuclear fusion reaction compare to the mass of the original elements?

Consider the fusion reaction H + H + H → He + H + n The atomic masses are: H: 2.01410 u He: 4.00260 u H, 1.00783 u n: 1.008665 u What mass of deuterium fuel, H, is used up in producing 8.2 × 1013 J of energy by this reaction? (1u = 1.6605 × 10-27 kg = 931.5 MeV/c2)

Scandium, Sc, decays by emitting a positron. What is the nuclide that is the product of the decay?

Uranium-238 decays into thorium-234 plus an alpha particle. How much energy is released in this process? 1 u = 931.494 MeV/c2, and the relevant mass values are He: 4.002603 u Th: 234.043583 u U: 238.050786 u

In the fission reaction U + neutron → Ba + Kr + x neutrons, what is the number x of neutrons produced?

A proton strikes an O nucleus producing F and another particle. What is the other particle?

A 70-kg laboratory technician absorbs 2.9 mJ of 0.50-MeV gamma rays in a workday. How many gamma-ray photons does the technician absorb in a workday?

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Filters

Consider the fusion reaction H + H + H → He + H + n The atomic masses are: H: 2.01410 u He: 4.00260 u H, 1.00783 u n: 1.008665 u What mass of deuterium fuel, H, is used up in producing 8.2 × 10¹³ J of energy by this reaction? (1u = 1.6605 × 10^-27 kg = 931.5 MeV/c²)

Uranium-238 decays into thorium-234 plus an alpha particle. How much energy is released in this process? 1 u = 931.494 MeV/c², and the relevant mass values are He: 4.002603 u Th: 234.043583 u U: 238.050786 u