The following are incandescent light bulb questions. (Several billion bulbs are used in the United States each year.)
(a) The gas in a light bulb is not air, but is a mixture of argon and nitrogen gases at low pressure. Why isn’t air used? Wouldn’t it be cheaper?
(b) After long periods of use, a gray spot develops on the inside of a bulb. What is this gray spot? (Hint: It is metallic.)
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