Two electrons are moving with different kinetic energies. If 1st electron is moving with kinetic energy k and the 2nd electron with kinetic energy 4k, the ratio of their de Broglie wavelengths will be respectively:

1 : 2 1 : 4 2 : 1 4 : 1

2 : 1

The correct answer is Option (3) → 2 : 1