Question 1

The quark structure of the neutron is udd.What is the quark structure of the antineutron?&#10;A)&#10; &#10;B) ddu&#10;C)&#10; &#10;D) udd,since the neutron is its own antiparticle&#10;

Accepted Answer

11ea7a51_6346_b7a4_89bd_f7cebf63b277_TB5259_11

Question 2

Assuming the Hubble constant is (21 km/s)/(10⁶ ly),what is the recession speed of a galaxy 300 million parsecs away? (1 parsec = 3.26 ly) A) 4200 km/s B) 21,000 km/s C) 640 km/s D) 7000 km/s

Accepted Answer

First, convert 300 million parsecs to ly: 
300 million parsecs * 3.26 ly/parsec = 978 million ly
Then, use the Hubble constant to calculate the recession speed: 
(21 km/s)/(10^16 s/1 year) * 978 million ly = 21,038 km/s, which is closest to choice B, 21,000 km/s.

Question 3

The strong force is mediated by A) the gluon. B) the W^- boson. C) the W⁺ boson. D) All of these choices.

Accepted Answer

The strong force is mediated by the gluon, which is a massless boson. The other options are not valid bosons that have been identified in the study of particle physics.

Question 4

Which of the following forces is the strongest at near distances?&#10;A) gravitational&#10;B) weak nuclear&#10;C) strong nuclear&#10;D) electromagnetic&#10;

Accepted Answer

The strong nuclear force is the strongest force at near distances between subatomic particles. It is responsible for holding the nucleus of an atom together. While the electromagnetic force is stronger at larger distances. The gravitational force is the weakest of the four fundamental forces. The weak nuclear force is responsible for radioactive decay and is weaker than both the strong nuclear force and electromagnetic force.

Question 5

The following reaction can occur by the strong interaction: π⁰ + n → K⁺ + Σ^-.If the quark composition of the n is (udd),the π ⁰ is And the composition of the K⁺ is ,what is the quark composition of the Σ^-?

A) uds
B) dds
C) sss
D)

<strong>The following reaction can occur by the strong interaction: π<sup>0</sup> + n → K<sup>+</sup> + Σ<sup>-</sup>.If the quark composition of the n is (udd),the π <sup>0</sup> is And the composition of the K<sup>+</sup> is ,what is the quark composition of the Σ<sup>-</sup>?</strong> A) uds B) dds C) sss D) <div style=padding-top: 35px>

Accepted Answer

We can determine the quark composition of the Σ^- by comparing the quark compositions of the reactants and products. The quark composition of the neutron (udd) is the same as that of the Σ^-, except that one of the u quarks is replaced by an s quark. Therefore, the Σ^- must have a quark composition of uds. Choice B is the only option that matches this composition.

Question 6

If a K⁰ meson at rest decays in 0.90 × 10−¹⁰ s,how far will a K⁰ meson moving at 0.95c travel through a bubble chamber? (c = 3.00 × 10⁸ m/s) A) 2.6 cm B) 8.2 cm C) 9.3 cm D) 13 cm

Accepted Answer

The answer of If a K⁰ meson at rest decays...

Question 7

The microwave background radiation:&#10;A) represents the leftover glow from the Big Bang.&#10;B) had its slight non-uniformity measured by COBE.&#10;C) was discovered by Penzias and Wilson.&#10;D) All of the above.&#10;

Accepted Answer

Option A is correct because the microwave background radiation is the afterglow of the Big Bang. Option B is correct because the COBE (Cosmic Background Explorer) satellite was launched specifically to measure the non-uniformity of the microwave background radiation. Option C is correct because Penzias and Wilson discovered the radiation accidentally in 1964 while working with a microwave antenna. Therefore, the correct answer is D, "All of the above."

Question 8

Processes in which one type of quark is converted into another type of quark involve which force?&#10;A) electromagnetic&#10;B) strong force&#10;C) weak force&#10;D) gravitational&#10;

Accepted Answer

Processes in which one type of quark is converted into another type of quark involve the weak force.

Question 9

Of the quarks u,d,c,s,t,and b,which have positive fractional electronic charge?&#10;A) u,d,c&#10;B) d,s,b&#10;C) s,t,b&#10;D) u,c,t&#10;

Accepted Answer

The u (up), c (charm), and t (top) quarks each have a charge of +2/3, making them the quarks with positive fractional electronic charges.

Question 10

The exchange of mediating photons can produce&#10;A) neither a repulsive nor an attractive force.&#10;B) either a repulsive or an attractive force.&#10;C) a repulsive force.&#10;D) an attractive force.&#10;

Accepted Answer

The exchange of mediating photons can produce either a repulsive or an attractive force, depending on the type of interaction between the particles involved. For example, the exchange of photons between charged particles (like electrons or protons) can produce both attractive and repulsive forces, depending on the charges involved.

Question 11

A proton and antiproton each with total energy 800 GeV collide head-on.What is the total energy (particles + energy)released?&#10;A) zero&#10;B) 800 GeV&#10;C) 400 GeV&#10;D) 1600 GeV&#10;

Accepted Answer

The answer of A proton and antiproton each with total...

Question 12

Which of these particles has the least mass?&#10;A) electron neutrino&#10;B) muon&#10;C) electron&#10;D) pion&#10;

Accepted Answer

The answer of Which of these particles has the least...

Question 13

Of the following mesons,which is its own antiparticle? A) K^- B) φ C) π⁺ D) none of those given

Accepted Answer

The answer of Of the following mesons,which is its own...

Question 14

What following quantity is conserved in the following reaction:  &#10;?&#10;A) charge&#10;B) lepton number&#10;C) baryon number&#10;D) All of the above.&#10;

Accepted Answer

The answer of What following quantity is conserved in the...

Question 15

The cosmic background radiation appears compatible with a blackbody source at what temperature?&#10;A) 0.0003 K&#10;B) 3 K&#10;C) 300 K&#10;D) 0.03 K&#10;

Accepted Answer

The answer of The cosmic background radiation appears compatible with...

Question 16

The constituent quarks of the proton are uud.What are the charges on u and d?&#10;A)&#10; &#10;B)&#10; &#10;C)&#10; &#10;D)&#10; &#10;

Accepted Answer

The answer of The constituent quarks of the proton are...

Deck 31: Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics