INBDE (Integrated National Board Dental Examination) Practice Exam

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Ace your INBDE with our comprehensive practice exam. Featuring detailed explanations, interactive flashcards, and a wide array of multiple-choice questions designed to mirror the real test. Get ready to surpass your expectations!

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What happens when a filament is heated?

it contracts
it expands
it releases electrons
it becomes superconductive

The correct answer is: it releases electrons

When a filament is heated, it releases electrons. This is because the heat causes the atoms in the filament to vibrate, allowing the outermost electrons to break free from their bonds and be released into the surrounding environment. The other options (contraction, expansion, and superconductivity) are incorrect because they do not pertain to the specific behavior of a filament in response to heat. Filaments may experience contraction or expansion due to changes in temperature, but this does not occur when they are specifically heated. While some materials may become superconductive at certain temperatures, this is not a typical or expected outcome when a filament is heated.