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Homework Help: Fluorescent lamp

  1. Nov 1, 2009 #1
    1. The problem statement, all variables and given/known data
    Fluorescent lamps use phosphors to produce visible light from UV light. This is done by absorbing the UV light and then re-radiating it using a different wavelength. This is a

    a. one way process
    b. reversible process
    c. process that produces continuous spectrum
    d. process that produces a single wavelength only
    e. process that is very inefficient.

    2. Relevant equations

    3. The attempt at a solution
    I totally clueless....What should I understand first so that I can answer this question?

  2. jcsd
  3. Nov 1, 2009 #2


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    Homework Helper

    Since we are switching on and off the fluorescent several times, it must be a ...........?
    Fluorescent lamps produce line spectrum of several colors.
    Finally do you prefer very inefficient lamps?
  4. Nov 1, 2009 #3
    Hi Mr. rl.bhat
    reversible process

    It means that (c) and (d) are wrong

    Of course no :smile:

    Then I think the answer is (b).

    But what is the basic to say that it's an efficient lamp?

  5. Nov 1, 2009 #4


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    Homework Helper

    Unlike filament lamp, there is no resistance where the energy is lost due to heating.
    So for the same amount of energy consumption, more lumen of light is available in fluorescent lamp than in the filament lamp.
  6. Nov 1, 2009 #5
    Oh I see

    Thanks a lot for your help, Mr. rl.bhat !!
  7. Nov 14, 2009 #6
    My Tips:

    Product Features:

    * UV lamp illuminates invisible markings in an instant
    * Don’t be caught out with fake currency
    * Ideal for banknotes, credit cards, stamps, etc...
  8. Nov 14, 2009 #7
    Just a contribution; as far as i know Fluorescent lamps doesnt even generate heat when they are turned on,

    Correct me if am wrong,

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