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Maclaurin series

  1. May 17, 2015 #1
    My homework question is about the first law of blackbody radiation. I have to prove an expansion when
    for KT≫ℏw.
    After some rewriting of the formula i have (ex-1)-1

    because KT≫ℏw, x is close to zero, so i think i should use the maclaurin series.

    According Wolfram Alpha the series expansion is [PLAIN]http://www5b.wolframalpha.com/Calculate/MSP/MSP32441h2h6354114hd8ba00002hih32dh1h5ch337?MSPStoreType=image/gif&s=14&w=174.&h=59. [Broken] [Broken] and this is exactly what i have to prove. But i have no idea how to come here. I tried to use all my knowledge but i don't even come close to the expansion that it should be...

    So my question is: what are the steps from (ex-1)-1 to [PLAIN]http://www5b.wolframalpha.com/Calculate/MSP/MSP32441h2h6354114hd8ba00002hih32dh1h5ch337?MSPStoreType=image/gif&s=14&w=174.&h=59. [Broken] [Broken]

    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. May 17, 2015 #2


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    First, find the expansion for ##e^x - 1##. Then think Binomial.
    Last edited by a moderator: May 7, 2017
  4. May 17, 2015 #3


    Staff: Mentor

    What do KT and ℏw have to do with (ex - 1)-1?

    Per Physics Forums rules, homework questions need to be posted using the homework template, which includes a complete problem statement. I am locking this thread. Please start a new thread with the information that's needed.
    Last edited by a moderator: May 7, 2017
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