Messing with an electron

Electricity and Magnetism Level 2

An electron, practically at rest is initially accelerated through a potential difference \(100 \text{ V}\). It then has a de Broglie wavelength of \(x_1\).

It then gets retarded through \(19 \text{ V}\) and has a wavelength of \(x_2\).

A final retardation through \(32 \text{ V}\) changes the wavelength to \(x_3\).

What is \(\displaystyle\frac{x_3-x_2}{x_1}\) as a percentage?


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