Question 1

According to present theories,there is a neutrino for all the following particles except

Accepted Answer

A) the neutral pion. 
B) the electron. 
C) the muon. 
D) the tau lepton. 
A) the neutral pion. 
B) the electron. 
C) the muon. 
D) the tau lepton.

Question 2

The size and sign of the charge on an electron is the same as that for

Accepted Answer

A) a positron. 
B) an antiproton. 
C) an antineutron. 
D) an antineutrino. 
A) a positron. 
B) an antiproton. 
C) an antineutron. 
D) an antineutrino.

Question 3

The microwave background radiation

Accepted Answer

A) represents the leftover glow from the Big Bang. 
B) was discovered by Penzias and Wilson. 
C) had its slight non-uniformity measured by COBE. 
D) All of the above. 
A) represents the leftover glow from the Big Bang. 
B) was discovered by Penzias and Wilson. 
C) had its slight non-uniformity measured by COBE. 
D) All of the above.

Question 4

Of the quarks u,d,c,s,t,and b,which have positive fractional electronic charge?

Accepted Answer

A) u,d,c 
B) d,s,b 
C) s,t,b 
D) u,c,t 
A) u,d,c 
B) d,s,b 
C) s,t,b 
D) u,c,t

Question 5

In a fission reaction,a 235U nucleus captures a neutron.What energy is released if the products are 139I,95Y and two neutrons? (atomic masses: 235U,235.043 9;139I,138.935 0;95Y,94.913 4;neutron,1.008 67;and 1 u = 931.5 MeV/c2)

Accepted Answer

A) 123 MeV 
B) 174 MeV 
C) 199 MeV 
D) 218 MeV 
A) 123 MeV 
B) 174 MeV 
C) 199 MeV 
D) 218 MeV

Question 6

Which particle in the free state is least stable?

Accepted Answer

A) electron 
B) photon 
C) neutron 
D) proton 
A) electron 
B) photon 
C) neutron 
D) proton

Question 7

Calculate the range of the force that might be produced by the virtual exchange of a proton.Assume ΔE⋅Δt = h/2π.(mp = 1.67 × 10−27 kg,c = 3.00 × 108 m/s,and h/2π = 1.05 × 10−34 J⋅s)

Accepted Answer

A) 6.72 × 10−25 m 
B) 2.10 × 10−16 m 
C) 6.00 × 10−8 m 
D) 1.54 × 10−15 m 
A) 6.72 × 10−25 m 
B) 2.10 × 10−16 m 
C) 6.00 × 10−8 m 
D) 1.54 × 10−15 m

Question 8

According to the standard model,there are some cases in which a quark and its anti-quark have the same

Accepted Answer

A) charge. 
B) baryon number. 
C) strangeness. 
D) All of the above are always different. 
A) charge. 
B) baryon number. 
C) strangeness. 
D) All of the above are always different.

Question 9

When considering the law of conservation of lepton number for a reaction,how many different lepton numbers must be checked?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 6 
A) 1 
B) 2 
C) 3 
D) 6

Question 10

A positron and an electron differ in

Accepted Answer

A) charge. 
B) mass. 
C) spin. 
D) energy. 
A) charge. 
B) mass. 
C) spin. 
D) energy.

Question 11

The K-ratio in a uranium fuel reactor is defined as the average number of neutrons from each fission event that will cause another event.In a well-functioning reactor,it is desired that the K-ratio have what value?

Accepted Answer

A) zero 
B) 0.5 
C) 1.0 
D) 2.0 
A) zero 
B) 0.5 
C) 1.0 
D) 2.0

Question 12

The quark structure of the neutron is udd.What is the quark structure of the antineutron?

Accepted Answer

A)    
B) ddu 
C)    
D) udd,since the neutron is its own antiparticle 
A)    
B) ddu 
C)    
D) udd,since the neutron is its own antiparticle

Question 13

The constituent quarks of the proton are uud.What are the charges on u and d?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 14

Which of the following forces is the strongest at near distances?

Accepted Answer

A) gravitational 
B) weak nuclear 
C) strong nuclear 
D) electromagnetic 
A) gravitational 
B) weak nuclear 
C) strong nuclear 
D) electromagnetic

Question 15

What is meant by a particle being elementary?

Accepted Answer

A) It is too small to see. 
B) It is subatomic. 
C) It is not composed of other particles. 
D) It has no charge. 
A) It is too small to see. 
B) It is subatomic. 
C) It is not composed of other particles. 
D) It has no charge.

Question 16

The law of conservation of strangeness tells us that strangeness is not conserved for which of the following interactions?

Accepted Answer

A) strong 
B) electromagnetic 
C) weak 
D) All three of the above interactions conserve strangeness. 
A) strong 
B) electromagnetic 
C) weak 
D) All three of the above interactions conserve strangeness.

Question 17

The medical diagnostic technique PET stands for

Accepted Answer

A) proton energizing test. 
B) phosphorus electron tracing. 
C) precision electronic tracking. 
D) positron emission tomography. 
A) proton energizing test. 
B) phosphorus electron tracing. 
C) precision electronic tracking. 
D) positron emission tomography.

Question 18

If a K0 meson at rest decays in 0.80 × 10−10 s,how far will a K0 meson moving at 0.96c travel through a bubble chamber? (c​ = 3.00 × 108 m/s)

Accepted Answer

A) 8.2E-2 m 
B) 2.3E-2 m 
C) 6.5E-3 m 
D) 1.2E-1 m 
E) ​4.6E-3 m 
A) 8.2E-2 m 
B) 2.3E-2 m 
C) 6.5E-3 m 
D) 1.2E-1 m 
E) ​4.6E-3 m

Question 19

A photon hits an electron,and an antiproton is created.Some uncharged particles must have left the collision.These may be

Accepted Answer

A) neutron and neutrino. 
B) neutron and antineutrino. 
C) photon and neutrino. 
D) photon and antineutrino. 
A) neutron and neutrino. 
B) neutron and antineutrino. 
C) photon and neutrino. 
D) photon and antineutrino.

Question 20

If two quarks in an anti-proton have the color anti-red and anti-blue,the third quark must have the color

Accepted Answer

A) red. 
B) blue. 
C) anti-purple. 
D) anti-green. 
A) red. 
B) blue. 
C) anti-purple. 
D) anti-green.

Exam 30: Nuclear Energy and Elementary Particles

According to present theories,there is a neutrino for all the following particles except

The size and sign of the charge on an electron is the same as that for

The microwave background radiation

Of the quarks u,d,c,s,t,and b,which have positive fractional electronic charge?

In a fission reaction,a 235U nucleus captures a neutron.What energy is released if the products are 139I,95Y and two neutrons? (atomic masses: 235U,235.043 9;139I,138.935 0;95Y,94.913 4;neutron,1.008 67;and 1 u = 931.5 MeV/c2)

Which particle in the free state is least stable?

Calculate the range of the force that might be produced by the virtual exchange of a proton.Assume ΔE⋅Δt = h/2π.(mp = 1.67 × 10−27 kg,c = 3.00 × 108 m/s,and h/2π = 1.05 × 10−34 J⋅s)

According to the standard model,there are some cases in which a quark and its anti-quark have the same

When considering the law of conservation of lepton number for a reaction,how many different lepton numbers must be checked?

A positron and an electron differ in

The K-ratio in a uranium fuel reactor is defined as the average number of neutrons from each fission event that will cause another event.In a well-functioning reactor,it is desired that the K-ratio have what value?

The quark structure of the neutron is udd.What is the quark structure of the antineutron?

The constituent quarks of the proton are uud.What are the charges on u and d?

Which of the following forces is the strongest at near distances?

What is meant by a particle being elementary?

The law of conservation of strangeness tells us that strangeness is not conserved for which of the following interactions?

The medical diagnostic technique PET stands for

If a K0 meson at rest decays in 0.80 × 10−10 s,how far will a K0 meson moving at 0.96c travel through a bubble chamber? (c​ = 3.00 × 108 m/s)

A photon hits an electron,and an antiproton is created.Some uncharged particles must have left the collision.These may be

If two quarks in an anti-proton have the color anti-red and anti-blue,the third quark must have the color

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In a fission reaction,a ²³⁵U nucleus captures a neutron.What energy is released if the products are ¹³⁹I,⁹⁵Y and two neutrons? (atomic masses: ²³⁵U,235.043 9;¹³⁹I,138.935 0;⁹⁵Y,94.913 4;neutron,1.008 67;and 1 u = 931.5 MeV/c²)

Calculate the range of the force that might be produced by the virtual exchange of a proton.Assume ΔE⋅Δt = h/2π.(m_p = 1.67 × 10−²⁷ kg,c = 3.00 × 10⁸ m/s,and h/2π = 1.05 × 10−³⁴ J⋅s)

If a K⁰ meson at rest decays in 0.80 × 10−¹⁰ s,how far will a K⁰ meson moving at 0.96c travel through a bubble chamber? (c = 3.00 × 10⁸ m/s)