Physics Unit32: Elementary Particles - 51fly国际课程 (51fly.win)

1#

What happens to the cyclotron frequency of a charged particle if its sf 2-jycamh+qoq; 5j r;qe,571 vzzgdxpeed doublesmqfa, hz5j5zd2 q;7qy j-e 1 +;grxcov?

A. It triples.

B. It doubles.

C. It halves.

D. It does not change.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What happens to the cycslp8..jla s48itf b2/cym* ipsba75clotron frequency of a charged particle if the radius of its path5sb lmscfjalp8cps 4a8i .2.*7y/itb doubles?

A. It triples.

B. It doubles.

C. It halves.

D. It does not change.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The Feynman diagram shows two elect7hf i dvb,;phl.3wz 5erons approaching each other, interacting, and then.3,h5;zph evwlb 7ifd leaving each other. What particle is being exchanged during the interaction?

A. pion

B. virtual photon

C. neutrino

D. $W$ particle

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The Feynman diagram shxw8xv5;b rhu;ows the weak interaction of a neutrino ($\nu$) and a neutron ($n$), mediated by a $W+$ particle. The interaction produces an electron ($e-$) and another particle. What is the other particle?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A positively charged e qr pk(h(y8;qk -m matt,p( 0c.aal-ttlectron is

A. called a proton.

B. called a positron.

C. also called an electron.

D. not found in nature.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What effect does an increase in the maxh9e9uoc4 ys0ss of the virtual exchange particle have on the range of txh94uyso 0 9eche force it mediates?

A. decreases it

B. increases it

C. has no appreciable effect

D. decreases charged particle interactions and increases neutral particle interactions

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An exchange particle forf y uqg3,)bkxvkh,)kz29;pbc1hjdw0 the weak force is the

A. photon

B. meson

C. W particle

D. graviton

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The exchange particles for the weak force are very massive (ab5 dn.un4b o(yif0t oi:out 100 times as massive as a proton). This would leadb 4nf oiy:5 nid(o0u.t one to expect that the weak force would

A. act over a very long range.

B. act over a very short range.

C. only act on very massive particles.

D. be transmitted at the speed of light.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The exchange particlrnxgp dbxf1(q 0 ek(y,oa1q*.7 zh8mjnqw:z -e for quarks is called

A. the stickon.

B. the gluon.

C. the epoxyon.

D. the epsilon.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A particle that travels at the speedw/ssbg i /vd5(au1lw 4 of light

A. has never been observed.

B. must have zero rest mass.

C. must have a very large rest mass.

D. has infinite energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

One reason a photon could not create an odd number of electrons anzlo:+*x:eq0yv q5 oh zd positrons is that such a process w:v+ole*hx 5y0zqqoz :ould

A. not conserve charge.

B. not conserve energy.

C. require photon energies that are not attainable.

D. result in the creation of mass.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is the following decay permissible? 8icu, z/akby+$\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

A. yes

B. No, because charge is not conserved.

C. No, because mass is created.

D. No, because lepton number is not conserved.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is the following decay allok n)2*gkob6+ 18skea9rzw f :r9 xgpbqwed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

A. yes

B. No, because charge is not conserved.

C. No, because mass is created.

D. No, because lepton number is not conserved.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is the following decay allmdfn y:8;f+daowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

A. yes

B. No, because charge is not conserved.

C. No, because mass is created.

D. No, because lepton number is not conserved.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The neutrino has

A. enormous rest mass, positive charge, and spin quantum number 1/2.

B. negligible rest mass, negative charge, and spin quantum number 1.

C. negligible rest mass, no charge, and spin quantum number 1/2.

D. none of the given answers

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is an example ozni28 cuu.uwu y2z29.nds0x; ;gi j izf

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton is an example1( evdr ak6x7e of

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A neutron is an example)k yf* *(s0i5tw 9ka.oogjxc j of

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A photon is an example 4x7 p-tk:if yxof

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Particles that do not interact via the strbx6l,ancc9) cjtm6 9o r,yo.d ong force but do interact via the weak nuclear force (and presumably byc6 r6omya b,nc ,d)ct9 j9xol. the much weaker gravitation force) are called

A. gauge bosons.

B. leptons.

C. baryons.

D. mesons.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Hadrons are divided into two subzni2*l f:ryk kg96or* groups called

A. baryons and leptons.

B. leptons and mesons.

C. mesons and baryons.

D. nucleons and gauge bosons.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A quark is

A. a constituent of a nucleon.

B. a constituent of a hadron.

C. an elementary particle.

D. all of the given answers

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the quark comm68m5rg jdrwbo 6l.9xxe1 n.fposition of a $\Lambda^{\circ}$?

A. uud

B. uus

C. uds

D. uss

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A distinctive feature of quarks agzjt6+.cte,h6 o;jmis that they

A. have zero rest mass.

B. have zero charge.

C. have fractional electric charge.

D. are always observed singly, since they do not readily interact with other particles.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The charge of some qpd*5 b+aq(s11xsae /j nqlf0n uarks and antiquarks is

A. e/4.

B. e/3.

C. e/2.

D. e.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a quark emits or absorbs a zg;d;mu,o g ne*6 3j*pqxnj:ijyk 8d5 gluon, the quark changes

A. its charge.

B. its mass.

C. its color.

D. into an antiquark.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The number of types of k0az5e9o90scosmm//g ye (e. ;uovka quarks is

A. 2.

B. 3.

C. 6.

D. 8.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is not considered to be one of the fomdtx r6.g-lm3p q.l4xur fundamental force lr.t-xx3 .p4 qmdm6gls?

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A significant step in "unifying" the forces lbkkyw j8j6 6ls1:4 grof nature was the discovery that two of the so-called fundamental forces were two parts ofk4g16yw 8s bjkllr :j6 a single force. The two forces that were so unified were

A. the electromagnetic force and the weak force.

B. the electromagnetic force and the strong nuclear force.

C. the electromagnetic force and the gravity force.

D. the weak force and the strong nuclear force.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The grand unified theory (GUT) is a sought-after model that gw0y1ven)s:q would unify three of the four forces ofyn1evq s: 0)wg nature. Which force is the one it would not include?

A. gravitational

B. strong

C. weak

D. electromagnetic

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the wavelength for a beam of 1.4 a+uyc u/ lqvobi:p bvn5;*4 c-GeV electrons?

A. $8.8 \times 10^{-14} \; m$

B. $8.8 \times 10^{-15} \; m$

C. $8.8 \times 10^{-16} \; m$

D. $8.8 \times 10^{-17} \; m$

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclotron operates at 10 MHz. What magnetic field is needed to accelerate pro;,yvcm t iol5wo nuxun-..enxtnven8f:143 ( tonsfv-nc. ennenxn :i 45o1 ylvmuw8x., 3;(tuot?

A. $0.12 \; T$

B. $0.25 \; T$

C. $0.66 \; T$

D. $1.5 \; T$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclotron of radius 0.25 m acceleratzko 4gqy:obgl 0)hy)6es protons in a 1.7-T magnetic field. What is thk6oh)glyz4b y g):qo0e frequency for the applied alternating voltage?

A. $0.26 \; MHz$

B. $2.6 \; MHz$

C. $26 \; MHz$

D. $260 \; MHz$

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T mn1k ,2 nzppgu7agnetic field. What is the kinetic energy of nkp7zu 1, 2gpnthe protons when they leave the cyclotron?

A. $7.8 \; keV$

B. $8.7 \; keV$

C. $7.8 \; MeV$

D. $8.7 \; MeV$

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A deuteron has the same charge as a protoffzp+5m k w,n5n but approximately twice the proton mass.z5mf,f5knw p+ Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 Mhz. What magnetic field is needed?

A. $0.011 \; T$

B. $0.11 \; T$

C. $1.1 \; T$

D. $11 \; T$

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Suppose you were to try to create a proton-antiprotl*wkz mz f8zp8lo08;ix 3ne3g on pair by annihilation of a very high energy photon. fl83l ;gz0w zm3z xno88*k iep The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be required?

A. $1.022 \; MeV$

B. $1880 \; MeV$

C. $940 \; MeV$

D. $223 \; MeV$

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a positronium atom (electron + positron) decays, it emits two photons. k2da9o*l b x6ksma7 kiv)8yp: What are lki:9yam2vapx*k8)sd6 bk o7 the energies of the photons?

A. 0.511 MeV and 1.022 MeV

B. 0.225 MeV and 0.285 MeV

C. 0.256 MeV and 0.256 MeV

D. 0.511 MeV and 0.511 MeV

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The pe meson has a mass of 264 times that oe q6oyh;*hnp.;rb jm 6f an electron. What is the range of th6;nm6ehhr o .;y* jpqbe force mediated by this particle?

A. $1.5 \times 10^{-10} \; m$

B. $1.5 \times 10^{-12} \; m$

C. $1.5 \times 10^{-14} \; m$

D. $1.5 \times 10^{-15} \; m$

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the range of a hypothetical force with the n6+o, of:d qc0+oe*oz u(zeyd0bbu ) iproton as the virtual exchange particlq+buny uodzioo*)o 0f(,z b+e6cde:0 e.

A. $6.7 \times 10^{-25} \; m$

B. $2.1 \times 10^{-16} \; m$

C. $1.5 \times 10^{-15} \; m$

D. $6.0 \times 10^{-8} \; m$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Identify the missing particle in the following r :cx s5fac2dk6cet4.l eaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

A. $p$

B. $n$

C. $e$

D. $\nu_{\mu}$

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Identify the missing particle in the fo0j:j d1kf-fm q-u g7iom89cgx llowing reaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

A. $p$

B. $n$

C. $e$

D. $\nu_{\mu}$

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Identify the missing particle in the follo)k3aq4o5ro j*bp4q lhwing reaction. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

A. $p$

B. $n$

C. $\pi^{\circ}$

D. $\nu_{\mu}$

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The number of quarks in a deute:a.: yyw c2eieron ($^2 H$) is

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