De Broglie extended duality from light to matter, implying that particles should also show:
AZero rest mass
BInfinite speed
CConstant charge
DWave behaviour
Answer & Solution
Correct answer: D. Wave behaviour
1. The symmetry runs in both directions.
2. Light was already known to behave as both wave and particle.
3. In 1923 de Broglie made a radical proposal.
4. It rested on the hope that nature is symmetric.
5. So if waves can act as particles, particles should show wave behaviour.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 29 'Quantum Physics', sections 29.1-29.8_
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