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An incandescent bulb has a thin filament of tungsten that is heated to high temperature by passing an electric current. 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 CAREER POINT CAREER POINT , CP Tower, IPIA, Road No.1, Kota (Raj.), : 0744-6630500 | www.ecareerpoint.com Email: info@cpil.in Page # 13 Paper-1 [ CODE – 0 ] from the filament. If the bulb is powered at constant voltage, which of the following statement(s) is(are) true ?

1. The temperature distribution over the filament is uniform
2. The resistance over small sections of the filament decreases with time
3. The filament emits more light at higher band of frequencies before it breaks up
4. The filament consumes less electrical power towards the end of the life of the bulb

Correct answer: The filament consumes less electrical power towards the end of the life of the bulb

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