Answer:

Explanation:
The energy of a photon is given by:

where
h is the Planck constant
c is the speed of light
is the wavelength of the photon
In this problem, we have a microwave photon with wavelength

Substituting into the equation, we find its energy:

Answer:
How long or wide something is
Explanation:
It takes work to push charge through a change of potential.
There's no change of potential along an equipotential path,
so that path doesn't require any work.