Question Detail
Question
Calculate the de-Broglie wavelength of an electron which has been accelerated from rest by a potential of 400 volts.
Correct Answer
Option C is the correct answer.
Detailed Explanation
Using the standard formula λ(Å) = 12.27/√V, with V = 400V: λ = 12.27/√400 = 12.27/20 ≈ 0.6135Å.
Hint
Use the shortcut formula λ(Å) = 12.27/√V for electrons accelerated from rest through a potential V.