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习题练习:Physics Unit33: Astrophysics and Cosmology



 作者: admin   总分: 24分  得分: _____________

答题人: 匿名未登录  开始时间: 23年05月02日 09:52  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  
  The appearance of the great range of brightness among stars is , ikem9o0l2-*ign ompdue to

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The absolute luminosity for most stah;v 7 eyg;eberl07 vp 88cv5kkrs depends on the

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Four different main-sequen o+iedkh6 cm;y/+qv7bce stars are colored blue, orange, red, and yellow. What is /e7by+ o cmv;d+ikq6h their rank from coolest to hottest?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A Hertzsprung-Russell dit ku,8ltr0+8b)klenj.i(rku agram shows stars on a plot of

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A white dwarf star with a mass equgdfwh bsdjy61 /+w.0x .0 rkcrc*(njual to that of the Sun is about the size of

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Chandrasekhar limit of stellar masi5cezmsh.wu-bi*y 3 7 s (below which a star will collapse into a white dwar3 wy- si5embu.ciz *h7f) is, if the mass of our Sun is M, about

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Supernovas are thought to always re8 5mn . (/yistqr0njiysult in

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Black holes

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pulsars are rapidly spinningd 9 +um6lrm8.zml hgr/ndwh1.

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10#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Einstein's principle of equiv 3pbft kcxl692alence.
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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Schwarzschild radius of a black hole is that radial dist ly- t)9jm/*bnwkodj 5ance from the center of a sphere within which not even light can escape. It was first discovered mathematically by Sy dn m*kj)/tj o-59lbwchwarzschild in 1916 after Einstein published his general relativity theory. It can be calculated from a star's mass M as: $R = 2GM/c^2$. Take the radius of both stars A and B as the Schwarzschild radius. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to star B will be

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When a distant source emits light of a particular wavelength k;h* e3wl gascil c/;(in the visible, and the sourcawlck(l; ; e3igc/h*s e is moving away from us, the color of the light appears to us to be shifted toward the

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cosmic background radiation corresponds to a temperature x-lr7aoqi4o4-yvwbo .-:wq wof about

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Sun has apparent s kluyq o1,m 9d;w1bztqx6.n; brightness at Earth ($1.5 \times 10^{8} \; km$ away) of B. What would be the apparent brightness of the Sun at Pluto, which is $6.0 \times 10^{9} \; km$ from the Sun?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A star has absolute luminosity equalr;jl)-poav: g fi epv-(87osx to that of the Sun ($1.5 \times 10^{8} \; km$ from the Earth) but is 10 pc away from the Earth. By what factor will it appear dimmer than the Sun?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Earth's orbit has a mean r/it +2m zhattf70d tb+adius of $1.5 \times 10^{8} \; km$. Over a six-month period, the apparent position of a particular star varies by $0.00014^{\circ}$ due to parallax. How distant is the star, in km?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Earth's orbit has a mean radiusy3 8laizz0lg2 of $1.5 \times 10^{8} \; km$. Over a six-month period, the apparent position of a particular star varies by $0.00014^{\circ}$ due to parallax. How distant is the star, in ly? (1 ly = $9.46 \times 10^{15} \; m$)

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the parallax angle for Proxima Centauri, whk fq.uqh;xx9nfrge)az,t /t2*i9 ,e uich is Earth's nearest star at f;f)9ghk zrxt,qeai,t */ u eunx9 q.24.3 ly?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The apparent brightnepfjiv uch l-a f*xy8b 942ic++zuk2t5ss of a star is $1.0 \times 10^{-12} \; W/m^{2}$ and the peak wavelength is 600 nm. Estimate its distance from us.

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  It can be shown that the ly j9x ijz6n(kgl2i1t9l58lgapproximate age of the universe is 1/H, where H is the Hubble constant. Taking H = 20 km/s/Mly, estimate tlj 29l6n8 tgk (iijxl19z5lyg he age of the universe, in years.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a galaxy is moving away from us a oac 2z1kfy5c3t 1.0% of the speed of light, how far away is it from usc5 2cz3aykof1?

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Estimate the speed of a galaxy that it x hw/1qur8t,s 10 billion light-years away.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Estimate the observed wavelength for the 656 nm line in th:tw p vtjw:yx-fbq7(md16u )e e spectrum of a star whichvp-j:mw67uxy)(bqd: e ftwt 1 is 100 million light-years from us.

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  About 1 ms after the Big Bang, the te bspg h7icudk5/+)m5p s6hau:mperature of the universe was about 1013 K. What energy (i ps/usb pd 5mgc6ka: 5hu+hi7)n eV) does this correspond to?

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