Which of the following symbols
represents a photon? Lowercase 𝜐, 𝜈, lowercase y,
uppercase Y, or uppercase 𝛶, lowercase 𝛾.
Alright, a photon, we can recall,
is a massless particle that serves at least two functions. First, it’s the name we give to the
smallest possible packet of light energy. So when electromagnetic radiation
or light is transmitted from one location to another, we say that that happens via
photons. But then a second function of
photons is to serve as what’s called a force carrier. If we have two electrically charged
objects, say this one and this one, then the way that there’s an electromagnetic
force from one object to the other is via or by the exchange of photons.
In this case, the photon is not
transmitting light but rather transmitting force, electromagnetic force. Anyway, the symbol we use to
represent this particle is the lowercase Greek letter 𝛾. Among our answer options, we see
that as choice (E), and so that will be our answer. It’s lowercase 𝛾 that represents a