The Schwarzschild radius of a 1-Mo black hole is approximately
a. 3 km.
b. 1,500,000 km, the size of the Sun.
c. 150,000,000 km or 1 AU.
d. 3 × 10^13 km or 1 pc.
a
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Mass is transferred from a normal star in a close binary system toward a white dwarf. The material that is transferred to the white dwarf forms a rapidly growing whirlpool of material known around the white dwarf known as a(n)
a. accretion disk. b. Lagrangian point. c. Algol paradox. d. planetary nebula. e. supernova remnant.
Which of these is NOT now on the surface of Mars?
A) Mars Global Surveyor B) Viking 1 C) Pathfinder D) Sojourner E) Spirit
A heat engine operating between a pair of hot and cold reservoirs with respective temperatures of 500 K and 300 K will have what maximum efficiency?
a. 60% c. 40% b. 50% d. 30%
The critical angle for total internal reflection is a:
A. is a single angle for which transmission through the boundary is zero B. a maximum angle of incidence, below which no light is transmitted through the boundary C. minimum angle of incidence, above which no light is transmitted through the boundary D. may be either a minimum or a maximum angle, depending on which of the indices of refraction is larger