Chapter EH, Problem 52R

Solution

Interpretation : A tungsten filament lasts longer in a halogen lightbulb than in a normal lightbulb to be evaluated.

Concept Introduction : Tungsten vapor is captured by bromine or other halogen molecules, which are then used to reintroduce tungsten atoms to the filament in halogen lights.

A tungsten filament lasts longer in a halogen lightbulb because the tungsten reacts with halogen gas and gets redeposited on the filament.

Halogen light bulbs when compared with standard light bulbs have a brighter output, a longer lifespan, and the potential to use less energy.

A portion of the tungsten in the filament of a normal lightbulb evaporates during operation and is then deposited on the interior of the bulb.

The evaporating tungsten in a halogen lamp undergoes a chemical reaction with the halogen gas and then is redeposited back onto the filament.

This increases the filament's lifespan.