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Thread: Energy exchange

  1. #1 Energy exchange 
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    According to planck's hypothesis of black body radiation..

    It states that energy exchange between the radiation and the oscillators cannot be continuous but in some discrete quantity of

    E=nhf

    I just wanted to be clear what does it mean to say that exchange of energy cannot be continuous....
    i am just a little confused...


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  3. #2  
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    Well, if I am interpreting what you said correctly, that means that single photons must be given off instead of a continuous beam of energy. A flash light is not actually a perfectly continuous supply of EMR, it is composed of many packets of energy, each one being a multiplicative of Plank's Constant.


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  4. #3  
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    It means you cannot have any arbitrary value of energy, but only descrete values. Think of it like numbers representing values for energy. Only whole numbers of integer value are allowed as multiples of the basic unit of energy. Something like 2 or 5 would be allowed but 3.14 or 6.23 would not be allowed.
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  5. #4  
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    Quote Originally Posted by Cold Fusion
    A flash light is not actually a perfectly continuous supply of EMR, it is composed of many packets of energy, each one being a multiplicative of Plank's Constant.
    what does this mean........actually classically we do talk about average oscillators per unit volume in the frequency range f and df and is also used in the derivation of the planck radiation law...

    i mean planck did not tell anything about the quantisation of the photons...
    but instead told about the energy exchage between the oscillators and the raidation...isnt' it......



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  6. #5  
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    MigL is correct; you cannot have 'half an oscillation' with light, so only full steps are acceptable, which limits your precision in varying individual photon energy. However I am willing to bet that in the near future the QM nuts are going to invent half steps for the sake of their MATH.

    To reiterate, it means that when you increase the amplitude of a light beam, you are increasing the number of photons emitted per second. When you increase the frequency (discrete), you increase individual photon energy in the form of making it 'bluer'. Think of it as going from punching a wall 5 times per second, and then raising that to 10 times per second. When you double the rate, you double the energy being imparted. When this is done with light, you go from green to ultra violet, which can cause a nasty sunburn due to its raised 'hits per second'.
    Of all the wonders in the universe, none is likely more fascinating and complicated than human nature.

    "Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."

    "Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence"

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