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Differentiate De Broglies Theorem

  1. May 16, 2012 #1
    1. The problem statement, all variables and given/known data

    Someone has written down in some notes about differentiating DeBroglies Theorem.

    They've started with Px =h/λ
    (That's P sub x)

    Then they've simply said, this differentiated is:

    ΔPx = [-h/(λ^2)]Δλ

    How have they done this? What method? What have they differentiated with respect to?

    Thank you!

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. May 16, 2012 #2
    respect to λ

    P = h/λ

    dP/dλ = (-1/λ^2) * h

    dP = -(h/λ^2)dλ
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