Suppose the lowest band in a certain crystal is completely filled, but the gap between that band and the next higher one is 0.53 eV. What type of material is this?
A. A conductor
B. An insulator
C. A semiconductor
B. An insulator
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A huge interstellar cloud collapsed into a rotating disk with a central bulge. What did this object become?
A. The disk was the solar nebula and the bulge became the Sun. B. A large belt containing asteroids in a gap between the orbits of Mars and Jupiter. C. The disk was the Solar nebula and the bulge became Jupiter. D. They formed the outer planets which eventually met up with the Sun.
One star has a surface temperature of 6000 K and another has a surface temperature of 7000 K
If the two stars have the same absolute luminosity, and if the radius of the 6000 K star is R6 and the radius of the 7000 K star is R7, what is the ratio R6/ R7? A) 0.7 B) 1.2 C) 1.4 D) 1.6 E) 1.9
An apple pie will be a net emitter of energy when its temperature is
A) higher than its surroundings. B) lower than its surroundings. C) none of these
Supernova remnants differ from star forming regions because, although there is ionized hydrogen in both, supernova remnants
A) don't look like star forming regions. B) are much bigger than star forming regions. C) are located far from star forming regions. D) are more diffuse than star forming regions. E) contain no ionizing stars.