The energy that should be added to an electron, to reduce its de-Broglie wavelengths from \[{{10}^{-10}}\]m to \[0.5\times {{10}^{-10}}\]m, will be [KCET (Engg./Med.) 2000]

• A.            Four times the initial energy
• B.            Thrice the initial energy
• C.            Equal to the initial energy
• D.            Twice the initial energy