What is the most convincing piece of evidence to suggest that Martian meteorites actually come from Mars?
A) they are igneous rocks
B) they contain trapped gases with a similar composition to the Martian atmosphere
C) they are red in color
D) they show evidence for having been in contact with water
B
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A wire contains a steady current of 2 A. The number of electrons that pass a cross section in 2 s is:
A) 2 B) 4 C) 6.3 × 1018 D) 1.3 × 1019 E) 2.5 × 1019
Both a transverse wave and a longitudinal wave have
A) amplitude. B) frequency. C) wavelength. D) speed. E) all of the above
What is the current through a resistor if 4.0 × 1016 electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10-19 C)
A) 0.013 A B) 0.31 A C) 6.3 A D) 78 A
Which of the following best describes superconductors?
1.conductors that have less than half the resistivity of iron 2.conductors with essentially no resistance below a critical temperature, peculiar to each material 3.conductors which have a drop in their resistivity as their temperatures are lowered 4.Conductors are materials which are very useful in a variety of ways; hence the name "superconductor."