What are the two longest stages in the life of a one solar mass star?
a. Protostar, pre-main sequence.
b. Protostar, white dwarf.
c. Protostar, main-sequence.
d. Main-sequence, white dwarf.
D
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The image of an object beneath the surface of a medium of refractive index n > 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
a. real and closer to the viewer than the object. b. virtual and closer to the viewer than the object. c. real and farther from the viewer than the object. d. virtual and farther from the viewer than the object. e. virtual and the same distance from the viewer as the object.
The discovery of extra solar planets confirms Bode's law.
Answer the following statement true (T) or false (F)
A sievert (Sv) is
A) the SI unit of absorbed dose = 1 J/kg = 100 rad. B) 10-2 J/kg. C) 3.70 × 1010 decays/s in radium. D) a dosage of 2.58 × 10-4 C/kg. E) the effective dose of 1 Gy.
Pluto is no longer classified as a planet
Indicate whether the statement is true or false