Physics Electron, Photon, Photoelectric Effect and X-rays Karnataka - CET Previous Year Question MCQ (Single Correct)

The additional energy that should be given to an electron to reduce its de-Broglie wavelength from to is

A
2 times the initial kinetic energy
B
3 times the initial kinetic energy
C
0.5 times the initial kinetic energy
D
4 times the initial kinetic energy

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The correct answer is:
B

de Broglie wavelength of an electron having kinetic energy is where is the mass of an electron

or

Additional energy given

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