Question

If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor: 
 

• A. 2
• B. \( \frac{1}{2} \)
• C. \(\sqrt{2} \)
• D. \( \frac{1}{\sqrt{2}} \)

Hint:

The de-Broglie wavelength decreases as the kinetic energy increases, following the inverse square root relation.