Chemistry - Atomic Structure Question with Solution | TestHub

An electron practically at rest, is initially accelerated through a potential difference of 100 volts. It then has a de Broglie wavelength$={\mathrm{\lambda }}_1\mathrm{Å}$. It then get retorted through 19 volts and then has a wavelength${\mathrm{\lambda }}_2\mathrm{Å}$. It further retardation through 3.2 volts changes the wavelength to${\mathrm{\lambda }}_3$. What is the value of$\frac{{\mathrm{\lambda }}_3-{\mathrm{\lambda }}_2}{{\mathrm{\lambda }}_1}$?