Which of the following are advantages offered by the thorium nuclear reactor?
A) operates at relatively low temperatures
B) produces isotopes of short radioactive half-lives
C) difficult to use for bomb making
D) All of the above.
Answer: D
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In which area of the galaxy would you find stars with fairly circular orbits about the galactic center?
a. central bulge b. halo c. corona d. disk e. galactic center
Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about the two stars? Assume that no Doppler shifts are involved. (Hint: Think about the laws of thermal radiation.)
A) The red star is more massive than the blue star. B) The blue star is more massive than the red star. C) The blue star is farther away than the red star. D) The blue star has a hotter surface temperature than the red star. E) The red star has a hotter surface temperature than the blue star.
Two stars are both spectral type K2V; if the closer is magnitude +3.7, and the fainter is magnitude +8.7, then the brighter star is about ________ times closer
Fill in the blank(s) with correct word
A square plate has an area of 29.00 cm2 at 20.0°C. It will be used in a low temperature experiment at T = 10.0K where it must have an area of 28.00 cm2 . What area must be removed from the plate at 20.0°C for it to have the correct area at 10.0 K? (The coefficient of linear expansion is 10 × 10^?6 (°C)?1.)
a. 0.079 3 cm2 b. 0.159 cm2 c. 0.238 cm2 d. 0.836 cm2 e. 0.921 cm2