The work done by an external force to move a charge from point A to point B

is 15x10 44). If the charge was started

from rest and had of kinetic energy

4.82x10 KJ when it reached point B.

what must be the potential difference

between A and B? How far apart is

point B from point A?

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m