Multiple choice

Which metal is used in photo flash bulbs?

  1. Be

  2. Co

  3. Al

  4. Au
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A flashbulb is made up of a base, either metal or glass, a glass envelope usually coated on the interior and exterior with a plastic safety coating, primer paste, a tungsten igniter filament, a filling of shredded aluminum or other alloys with aluminum and oxygen. It fires when a voltage of 3-30V is applied to the ignition filament.

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