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

The additional energy that should be given to an electron to reduce its de-Broglie wavelength from 1nm to 0.5nm is

Options

(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

Correct Answer:

3 times the initial kinetic energy

Explanation:

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