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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 o2 sib1e jrq:i*. klya8f 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 mostswq+ xjm/j /;e 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. Wi3* o+nwauxkxrom 4t*.; ur5bhat is their rank from coolest t rbui*xk*4r ;ta.n mxo3+5u woo 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 showk+l2uu3w4r -na95j o x4 yatxys 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 Suyzjk*7 wzg3r8n 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 mass (below whichu0ylj2 l.n 8ch*vv 9zt a star will collapse into a u82vz. j9ylh*vntlc 0white dwarf) 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 thoughtjc -9rvlb6we hjhj)tw1xu:9* to always result 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 spinni9bqu :on20bg f iv1p*wng

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10#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Einstein's principl+eb7n t b1s+e82g:sm u2bcb mie of equivalence.
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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Schwarzschild radius mxf08sm pk tt4a:+sod(ly /rb ( n)j(xof a black hole is that radial distance from the center of a sphere within which not even light can escape. It w(mnf o/:)4tjssyrk+xdbpxt ( (8lma 0 as first discovered mathematically by Schwarzschild 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 in thu2hm -pvpcgl7 b/6.gp*5z svre visible, and the source is moving away from us, the color of the light appears to us to be 5*7muv6vh-s ppglg 2/p. bcr zshifted 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 tebgn10/ mj(tg,;d9jhhj j dt ygle*(:nmperature 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 a a zf-t:iiq. 9a//4 uigifsgb+t 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 equal tvc 4l5 hp.knr2 )s+ uvz:dwo,ko 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 radius o wm va,t/-gdl6hy/xncq dv40 *f $1.5 \times 10^{8} \; km$. 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 me6nmw b/zu io d,tt vg0(o;e5/wan 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 angle for Proxima Centauri, which is Earth's nearest star d2p sx:at2 r8 0.fc2yk)aszae-ma +mt at 4.3 mcm a2) :axftz2pr- 2a.a yk+ss8td e0ly?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The apparent brightnessde.s etxl5:-ey ,jmm(4vi1ipkx .w /c 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 theryum1ov/,9 j d4m 8tw: pfll(a approximate age of the universe is 1/H, where H is the Hubble constant. Taking H = 20 km/s/Mly, estimate the age of the universe, oj/r(1wv:y9mt,d 4lm8fp ualin 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 light, how b+g:tgtjy ,a 0far away is it ftg0t +ajgby,:rom us?

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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 is 10 q*,xsqh++g tc +pto-j 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 uprr(g t0lvb6l:eo7 ,nm line in the spectrum of a star which is 100 million(p:ge6 tvl,o l0brr7u 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 temperatur: 5ywsh3b-0lfb, aeja e of the universe was about 1013 K. What energy (in eV) does thi 0ayw - 53,ash:ejlbbfs correspond to?

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