Question

what is the speed of a photon in a vacuum​

Answer 1

Answer:

Structured photons slow down in a vacuum. The speed of light in a vacuum is 299,792,458 m s–1, right? Not necessarily, according to a team of physicists in the UK, which has found that the speed of an individual photon decreases by a tiny amount if it is initially sent through a patterned mask

Answer 2

Answer:

d is the answer

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