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习题练习:Nuclear & Quantum Physics E.5 Stellar Properties & Processes



 作者: admin   总分: 12分  得分: _____________

答题人: 匿名未登录  开始时间: 23年12月14日 16:27  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is correct for a stt2ai.00yx1gy c;i s wqable star?

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2#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  1.A star X is burning car e5wy w1 z*pq)g.vy6vvbon in its core. The reaction is given by:
$^{12}_{6}C$+$^{12}_{6}C$→$^{24}_{12}​Mg$
The following data are available for the reaction.
Rest mass of the$^{12}_{6}C$= 12.0111507u
Rest mass of the$^{24}_{12}​Mg$= 23.9909630u
Determine, in MeV, the energy released in the reaction. Be sure to express your answer to the correct number of significant figures. $ΔE$ =    MeV
2.The star Y is a red supergiant. State the next steps in the evolutionary sequence of the star Y.
3.Outline why the sun is not expected to undergo carbon fusion.

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is correct about a red giantv,sfnr-a*)ykf.2 u2v(e ai ha star?
I. The orbits of the inner planets of the solar system and could fit into the volume of it
II. Cooler than the Sun
III. Have higher luminosity than the Sun

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4#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  1.VV Cephei is a binary star system composed of two stars refak;;3lnx( kdnerred to as VV Cephek;;nalnxkd3 ( i A and VV Cephei B.
(1)The measured wavelength of the peak spectral line of VV Cephei A is 760 nm. Show that the surface temperature of VV Cephei A is approximately 3800 K. T =    K
(2)The surface temperature of the Sun is $T_⊙$​=5800 K. The luminosity of the VV Cephei A is $2.7\times10^5$ times the Sun's luminosity $L_⊙$​. Determine the radius of VV Cephei A in terms of the Sun's radius $R_⊙$​. R =    $R_⊙$​
3.A Herzsprung-Russel (HR) diagram is shown.


Plot the current position of VV Cephei A on the HR diagram and identify the classification of VV Cephei A.
2.The mass of VV Cephei B is about 11 times the mass of the Sun and it is not on the main sequence.
(1)In terms of forces, explain the condition that causes a star to first leave the main sequence.2
(2)Explain why VV Cephei B is likely to remain on the main sequence for a shorter time than the Sun.2
(3)The parallax angle for VV Cephei B is 0.31 arcseconds. Calculate, in light years, the distance between the earth and VV Cephei B.2. d =    ly
(4)State why the parallax method is not suitable for measuring the distance of very distant stars.

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A main sequence star has a mass greater than 4 times the mass ofh 6uz o cfkb)*2vyf9z5 the Sun. Which *f5c zo2)fh9u yvkbz6of the following is correct about the possible the fate of the star?
I. White dwarf
II. Neutron star
III. Black hole

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A star with a mass of twice the mass of the f+ )39;vqb7shl9eutgw av8txty 3p7 e sun is a main sequence star. The time t+9hq3et fytv7uas l 89 )p;x7wgbve3 the sun is expected to spend in the main sequence is T. Which of the following is correct for the time the star is expected to spend in the main sequence and the next stage in its evolution?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the core of a star, a proton-proto e7y92x/cw ;urn *2cpa*t dynin chain reaction takes place.
$4^1_1​H$→$^4_2​He$+$2^0_{+1}​β^+$+$2\,ν_e$​+$2\,γ$
After the initial stage of the reaction, two positrons annihilate with electrons present in the surroundings. Which of the following correctly shows the nature of the chain reaction and the energy released due to annihilation?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The parallax angles of Star v04j-(nmtac fdbv;o/A and Star B are 0.250 arcseconds and 0.500 arcseconds respectively. What is the shortest possible distance, in parsec, between S;am ov0/nt (4bf jvc-dtar A and Star B?

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A star with a mass similar to the Sun, a temperature 8ua 8q3*kqur;-o6wwnv wz g0f ry8vr/hotter than the Sun, and a radius similar to the Earth would be found in which re nz8rfuw6ov w*3-r08uqw ;y 8av/qgk rgion of the usual Hertzsprung-Russell diagram?


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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The luminosity of the Sun ++f /pwxv 6fn8mb pinr9uv6ap; yo/b2is $L_⊙$​. A main sequence star with twice the radius of the sun and twice the temperature of the sun has a luminosity of $L$. What is the ratio of $\frac{L}{⊙​L}​$ ?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Some regions on the H-R diagram are labelled.v+k yugpf 21cv b23-p k4ehgis(my)0h

A main sequence star with a mass of three times the Sun will evolve through a series of stages. Which of the following sequences of stages could correctly represent the path of the evolution of this star?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For fusion reactions to occur in a cloud of stetnu jb ehid/6lin 75(,llar dust, a combination of high temperature and high density among hydrogen nuclei is essential. Which of the ie7bi,56t nulh / ndj(following correctly shows why high temperature and high pressure are needed?

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