In general, how does the size and location of a star's habitable zone depend on the star's mass?
A) the smaller (less massive) the star, the smaller and the closer-in the habitable zone
B) the smaller (less massive) the star, the larger and the closer-in the habitable zone
C) the smaller (less massive) the star, the larger and the farther-out the habitable zone
D) The habitable zone is always about the same size, but its location moves inward for smaller stars.
A) the smaller (less massive) the star, the smaller and the closer-in the habitable zone
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A telescope that suffers from chromatic aberration and has a low light gathering power is most likely
a. a small diameter reflecting telescope. b. a small diameter refracting telescope. c. a large diameter refracting telescope. d. a large diameter reflecting telescope. e. an infrared telescope.
Two objects, one of mass m and the other of mass 2 m, are dropped from the top of a building. When they hit the ground:
A) both will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have half the kinetic energy of the lighter one. E) the heavier one will have one-fourth the kinetic energy of the lighter one.
A perfectly black sphere 18.0 cm in diameter is held at a temperature of 215°C. (? = 5.670 × 10-8 W/m2 ? K4,
Wien displacement law constant is 2.90 × 10-3 m ? K, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s) (a) Near what wavelength does this sphere radiate most strongly? (b) If all the radiated energy were at the wavelength found in part (a), how many photons would the sphere emit each second?
According to the text, an orbiting object having energy E < 0 follows an elliptical orbit. When we specify the numerical value for an object’s energy, we are implicitly comparing it to the energy the object has in some reference situation. So, when we say that E < 0 in this case, we are comparing the energy of the orbiting object to the energy of an object with the same mass that is
A. At rest at the primary’s center. B. At rest on the primary’s surface. C. In a circular orbit just above the primary’s surface. D. At rest at r = ?. E. Some other situation (specify).