A proton, a neutron,
Question:

 A proton, a neutron, an electron and an α-particle have the same energy. Then their de Broglie wavelengths compare as

(a) λp = λn > λe > λα

(b) λα < λp = λn < λe

(c) λe < λp = λn > λα

(d) λe = λp = λn = λα

Solution:

The correct answer is (b) λα < λp = λn < λe

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