The polarization of a light wave is determined by the direction
A. of the light's velocity.
B. of the fluorescent tube used as a light source.
C. perpendicular to both the electric and magnetic fields.
D. of the oscillating electric field.
Answer: D
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A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is
A) 10%. B) 50%. C) 90%. D) 110%. E) none of the above
If a magma contains molten forms of mineral A (30% silica) and mineral B (25% silica), which would crystallize last as the magma cools?
What will be an ideal response?
The appearance of the great range of brightness among stars is due to
A) the differences in the amount of light different stars emit. B) the differences in the distances of stars from us. C) both of the given answers D) none of the given answers
A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 10^5 J/kg)