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习题练习:Physics Unit33: Astrophysics and Cosmology



 作者: physics   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+zd( mpo -6ax.sy0j 5tsfv,ze of brightness among stars is due 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 mojcu;08ms1lxjmwa 0d2 st stars 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-sequence stars are colored blue, orange, red, and yellow. W0k(+xgvf6; ckueww 8 mhat is their rank from coolest to8xgf (kwcmvke w6+u0; 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 diagram 7dmwjlz,vq* a 08agf +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 equal to that of the Sun is abou1cq) f+tky 3sat 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 mass (below which a star will collapse into3p 5lddpu;u*3 synx f4:2gkg4lf(lsfk+ *wrv a white dwarf) is, if the mass of our Sun isy :5x2s dsukl fvg4 p (kdf**r4l;pu+3fwnl3g 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 rdy4 gm;ro /jzufz0-;eesult 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 spi2 l2ki *ba ufchz3b7,fnning

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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 )wjg.y,(dgqqj +u6fe0 z rsn,alence.
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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 distance7 u 7vbx m /k3p:yhc1otr zp,/oerpy:6 from the center of a sphere within which not even light can escape. It was first discovered mathematically by Schwarzsche 7pyo xp: yu/r:/c3 kmh1pbvz67,ort ild 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 ligbkhl+ fs6w *eoz q7*mi ag,q (9(:1pja adu)uoht of a particular wavelength in the visible, and the source is moving away from us, the color of the light appears to us to be shifted + q:b6a1zq((u oglji, wso7*am*pfu)eh d9ak 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 corresp izvw;, rnf:q.onds to a temperature of 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 brightness at Eart3ycf+i ck;2ej57eq 9vy-hzm bh ($1.5 \times 10^{8} \; km$ 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 v hvl x1*wfvjc22k2 u-equal 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 radw g7k9-sj ub6u6snt 5yu).ajtius 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 mm / kqe1(wiys2ean radius 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 anglwy+u: stjao8 8e for Proxima Centauri, which is Earth's nearest star at 4:+y8soujw8a t .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 brightn/,z4b4 9sj*dzlv qnzpess 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 approximate age of the universe is 1/H, w2irjhw4:a 7rfbq3 w h)kqh 4x64ack b6here H is the Hub 4w)2j: 6i rcxqw4f qk7ahb6hh34krab ble constant. Taking H = 20 km/s/Mly, estimate the 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 at 1.0% of the speed of li/yfil w ;m*;xg,z-oaekah06 cght, how far away is it from ;,zkle o0ga*xm/y; ahfc -6w ius?

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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 s okhs6g-* dm*xit6) upkf.m2 a galaxy that is 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 wavej v9 +.u0ru+s-ot8yh mbxwbm9 length for the 656 nm line in the spectrum of a star which i-0b9t x+wujs8. +yhvb9mr omus 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 temperature of the universe was abour3w ;yqdhg:xil. vjph.*)o2(qc(vwi t 1013 K. What energy (in eV) does this h v:)3qd( poq*xwyjl..r(wci ;vi hg2correspond to?

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  • 总分:24分 及格:14.4分 时间:不限时
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