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Current Electricity question

2016 · Shift 1 · Q50
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Current Electricity question

2016 · Shift 1 · Q50

JEE AdvancedPhysicsCurrent ElectricityMultiple correct+4 / −2
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 from the filament. If the bulb is powered at constant voltage, which of the following statement(s) is (are) true?
  1. A
    The temperature distribution over the filament is uniform
  2. B
    The resistance over small sections of the filament decreases with time
  3. C
    The filament emits more light at higher band of frequencies before it breaks up
  4. D
    The filament consumes less electrical power towards the end of the life of the bulb
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