An incandescent bulb has a thin filament of tungsten that is
An incandescent bulb has a thin filament of tungsten that is heated to high temperature by passing an electric The hot filament emits black-body radiation. The filament is observed to break up at random locations after a sufficiently long time of operation due to non-uniform evaporation of tungsten from the filament. If the bulb is powered at constant voltage, which of the following statement(s) is(are) true?
- The temperature distribution over the filament is uniform
- The resistance over small sections of the filament decreases with time
- The filament emits more light at higher band of frequencies before it breaks up
- The filament consumes less electrical power towards the end of the life of the bulb