58. The wire of flash bulb is made of: A.Copper B.Barium C.Magnesium D.Silver
Answer: Option C Solution: The first modern photoflash bulb (or flashbulb) was made by Austrian Paul Vierkotter, who used magnesium coated wire in an evacuated glass globe. It was later determined that aluminum foil in a low pressure oxygen atmosphere worked even better, and was cheaper to produce.
