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The de Broglie wavelengths for an electron and a photon are λ e and λ p respectively. For the same kinetic energy of electron and photon, which of the following presents the correct relation between the de Broglie wavelengths of two?

1. λ p ∝ 2 0 λ
2. λ p ∝ λ 0
3. λ p ∝ 0 λ
4. λ p ∝ 0 1 λ

Correct answer: λ p ∝ 2 0 λ

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