alleryA photon travels at a speed equal to that of:
ASound
BSteam
CSmoke
DLight
Answer & Solution
Correct answer: D. Light
1. Photons are the particles of radiation itself.
2. Each photon has speed c, the speed of light.
3. So the correct answer is light.
_Source: syllabus Physics Part II, Ch 11 'Dual Nature of Radiation and Matter'_
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