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De Broglie Wavelength Thought Problem

  1. Apr 2, 2014 #1
    1. The problem statement, all variables and given/known data
    A) Find the wavelength of an Ewok that has a mass of 50kg and is Running on Edor where 'h' id 1000Js at a velocity of 0.5m/s

    Yes the value of h to be used is 1000.

    B) What would the implications of him running be?


    2. Relevant equations
    [itex]\lambda=\frac{h}{p}[/itex]


    3. The attempt at a solution
    Part A: [itex]\lambda=\frac{h}{p} \\
    \lambda=\frac{1000}{50 \times 0.5}=40m[/itex]

    For part B: I wasn't quite sure to be honest, but surely with such a large wavelength and running, he would be "interfering" with himself quite badly ?
     
    Last edited: Apr 2, 2014
  2. jcsd
  3. Apr 2, 2014 #2
    I don't know where you got the value for Planck's constant but it is not correct. The accepted value is 6.62606957 × 10−34 joule∙second. Use 6.626x10-34 and your calculated DeB λ will be much smaller.
     
  4. Apr 2, 2014 #3
    This was a thought experiment, the value to be be used for the question is 1000Js. Its an imaginary scenario. A made up example by our lecturer to get us to think what would the implications be.
     
  5. Apr 2, 2014 #4

    DrClaude

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    Staff: Mentor

    Does anything happen to the de Broglie wavelength when he starts running?
     
  6. Apr 2, 2014 #5
    Ah, yeah. The perticular bit of coursework which had this question on has already been handed in but wanted to know if I got it correct or not, plus its interesting to think about.

    I assumed they meant constant velocity, but now thinking about it for part B it probably makes sense to assume he is not running at a constant velocity. But yes, if he speeds up then v will get bigger and the wavelength would therefore get shorter and the other way around if he slowed down.
     
  7. Apr 2, 2014 #6

    DrClaude

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    Staff: Mentor

    I wouldn't consider 0.5 m/s running, even for an Ewok :wink:
     
  8. Apr 2, 2014 #7
    True, I didn't think of that. They are much smaller though :p
     
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