An electron and an α-particle are accelerated through the same potential difference. If their de Broglie wavelengths are λₑ and λα, then:
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An electron and an α-particle are accelerated through the same potential difference. If their de Broglie wavelengths are λₑ and λα, then:

G1 Physics · Accepted Answer

For a nonrelativistic particle accelerated through V, λ = h/√(2mqV). Alpha particle has larger mass and charge 2e. Since mαqα ≫ mₑe, λα is much smaller than λₑ. Answer: A.