The main difference between an incandescent bulb and a fluorescent bulb is that the incandescent bulb
A) uses electromagnetic radiation to heat a wire, while a fluorescent bulb uses magnetic fields to heat a gas.
B) sends an electric current through a gas while the fluorescent bulb heats a thin wire electrically.
C) uses electric current to heat a wire, while a fluorescent bulb sends an electric current through a gas.
D) heats a wire by sending an electric current through it, while the fluorescent heats a solid powdery material by sending a current through it.
E) heats a wire by sending an electric current through it, while a fluorescent bulb uses magnetic fields to heat a gas.
Question 2
The law of gravity was invented by
A) Copernicus. B) Ptolemy. C) Galileo. D) Kepler. E) Newton.