"Sun-Tanning" in Glass Envelopes Is Caused by

question 68

Multiple Choice

"Sun-tanning" in glass envelopes is caused by

• A) the color the tube gets as it loses its resistance to heat over time
• B) oil leaking out of the protective housing
• C) the breaking of the glass envelope into small pieces of glass
• D) the vaporized tungsten from filament deposits that coats the inside of the glass

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