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?

  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
Anurag Mishra Professor Asked on 23rd May 2016 in Physics.
Add Comment
  • 1 Answer(s)

    Answer: (c) The filament emits more light at higher band of frequencies before it breaks up  &  (d) The filament consumes less electrical power towards the end of the life of the bulb

    Anurag Mishra Professor Answered on 24th May 2016.
    Add Comment
  • Your Answer

    By posting your answer, you agree to the privacy policy and terms of service.