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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 from the filament. If the bulb is powered at constant voltage, which of the following statement(s) is(are) true?
  • a)
    Th e temper ature distr ibution over the filamen t is uniform
  • b)
    The resistance over small sections of the filament decreases with time
  • c)
    Th e filament emits mor e light at h igher band of frequencies before it breaks up
  • d)
    he filament consumes less electrical power towards the end of the life of the bulb
Correct answer is option 'C,D'. Can you explain this answer?
Verified Answer
An incandescent bulb has a thin filament of tungsten that is heated to...
With the use of filament and the evaporation involved, the filament will become thinner thereby decreasing the area of cross-section and increasing the resistance. Therefore the filament will consume less power towards the end of life.
As the evaporation is non-uniform, the area of cross-section will be different at different cross-section. Therefore temperature distribution will be non-uniform. The filament will break at the point where the temperature is maximum.
When the filament temperature is higher  it emits light of lower wavelength or higher band of frequencies.
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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 from the filament. If the bulb is powered at constant voltage, which of the following statement(s) is(are) true?a)Th e temper ature distr ibution over the filamen t is uniformb)The resistance over small sections of the filament decreases with timec)Th e filament emits mor e light at h igher band of frequencies before it breaks upd)he filament consumes less electrical power towards the end of the life of the bulbCorrect answer is option 'C,D'. Can you explain this answer?
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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 from the filament. If the bulb is powered at constant voltage, which of the following statement(s) is(are) true?a)Th e temper ature distr ibution over the filamen t is uniformb)The resistance over small sections of the filament decreases with timec)Th e filament emits mor e light at h igher band of frequencies before it breaks upd)he filament consumes less electrical power towards the end of the life of the bulbCorrect answer is option 'C,D'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about 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?a)Th e temper ature distr ibution over the filamen t is uniformb)The resistance over small sections of the filament decreases with timec)Th e filament emits mor e light at h igher band of frequencies before it breaks upd)he filament consumes less electrical power towards the end of the life of the bulbCorrect answer is option 'C,D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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?a)Th e temper ature distr ibution over the filamen t is uniformb)The resistance over small sections of the filament decreases with timec)Th e filament emits mor e light at h igher band of frequencies before it breaks upd)he filament consumes less electrical power towards the end of the life of the bulbCorrect answer is option 'C,D'. Can you explain this answer?.
Solutions for 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?a)Th e temper ature distr ibution over the filamen t is uniformb)The resistance over small sections of the filament decreases with timec)Th e filament emits mor e light at h igher band of frequencies before it breaks upd)he filament consumes less electrical power towards the end of the life of the bulbCorrect answer is option 'C,D'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
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