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Electrons originally at rest are acceler...

Electrons originally at rest are accelerated through a potential difference of V volts. The applied potential differ- ence is measured using a voltmeter having a least count of DV. The electrons in the beam have a de-Broglie wavelength
of `lambda +- Deltalambda [Deltalambda ltlt]`. Find `|(Deltalambda)/(lambda)|`.

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