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A proton, a neutron, an electron and an α -particle have same energy. If λ p , λ n , λ e and λ α are the de Broglie’s wavelengths of proton, neutron, electron and α particle respectively, then choose the correct relation from the following:

1. λ p = λ n > λ e > λ α
2. λ α < λ n < λ p < λ e
3. λ e < λ p = λ n > λ α
4. λ e = λ p = λ n = λ α

Correct answer: λ α < λ n < λ p < λ e

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