An electron, practically at rest, is initially accelerated through a potential difference of 100 volts. It then has a de Broglie wavelength=$\lambda$1Å. It then get retarded through 19 volts and then it has wavelength $\lambda$2 Å. A further retardation through 32 volts changes the wavelength to $\lambda$3.

What is ($\lambda$3-$\lambda$2)/$\lambda$1?

(A) 20/41

(B) 10/63

(C) 20/63

(D) 10/41

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de Broglie Equation
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