Question

What possibly can be the rato of the de Broglie wavelengths for two electrons each having zero initial energy and accelerated through $50$ volts and $200$ volts?

• A. $3:10$
• B. $10:3$
• C. $1:2$
• D. $2:1$

Answer 1

The correct option is D $2:1$

De Broglie wavelength is inversely proportional to square root of accelerating potential.

Therefore,$\sqrt{\left(200/50\right)}$ =2:1

Hence , 2:1 is the correct answer.