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How to calculate the de Broglie wavelength of an $\alpha$ particle that is accelerated through a potential difference of $V$ from rest.

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    $\begingroup$ With the convenient search function, you can find similar questions including answers like this one: link $\endgroup$
    – engineer
    Commented May 2, 2015 at 9:36
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    $\begingroup$ Welcome to Physics.SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems. $\endgroup$
    – 299792458
    Commented May 2, 2015 at 11:05
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    $\begingroup$ When you google "de Broglie wavelength energy", the second hit is chemteam.info/Electrons/deBroglie-Equation.html . This tells you exactly how to do it. As @TheDarkSide said - the policies of this site discourage "do my homework for me" questions, and ask that you focus on principles and concepts in questions like this. $\endgroup$
    – Floris
    Commented May 2, 2015 at 12:07

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  • A=qU

    Based on work-energy theorem:

  • A=(mv^2)/2

  • (mv^2)/2 = qU

  • mv^2=2qU

mv=(2qU)/v

and then you can find the de Broglie wavelength by :

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