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    I don’t know how to work this question out??!! Help would be much appreciated.

    Calculate the (a) speed and (b) wavelength of an electron which has been accelerated from rest through a Pd of 250 volts.

    Thanks again
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    (Original post by Yodalam)
    I don’t know how to work this question out??!! Help would be much appreciated.

    Calculate the (a) speed and (b) wavelength of an electron which has been accelerated from rest through a Pd of 250 volts.

    Thanks again

    For (a), you need to use the conservation of energy.
    Work done by the electric field in accelerating the electron = change in KE of the electron.

    For (b), you need what you have named the title of the post - De Broglie Equation.
    You have the speed in (a), which mean you can work out the momentum of electron and substitute it into the de Broglie relationship to obtain the wavelength.

    I leave the working to you.
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    Got it, thanks
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