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    Hi all

    Wondered if anyone could help please? I have been analysing some data on the de Broglie wavelength andd was asked to plot a graph of v against 1 / λ

    The question then says that if v and 1 / λ are linked by the equation λ = h /mv what does the gradient of this graph show? Use the gradient to calculate h.

    Could anyone help by helping me find what the gradient represents and how I could use this to find h?

    Many thanks
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    (Original post by sibasford)
    Hi all

    Wondered if anyone could help please? I have been analysing some data on the de Broglie wavelength andd was asked to plot a graph of v against 1 / λ

    The question then says that if v and 1 / λ are linked by the equation λ = h /mv what does the gradient of this graph show? Use the gradient to calculate h.

    Could anyone help by helping me find what the gradient represents and how I could use this to find h?

    Many thanks
    We have y = v and x = 1/lambda

    we know that lambda = h/mv or lambda = h x 1/m x 1/v
    1/v = lambda x m/h

    v = mh/lambda.

    1/lambda = x, so gradient = mh

    if you have the m, you can calculate h

    (I think)
 
 
 
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