The energy is E=hc/w= 1.25uevm/715m = 1.748nev.
Yes.
Of course ultra violet.
Photon Energy E=hf = hc/w thus wavelength w= hc/E or the wavelength is hc divided by the energy of the photon or w= .2 e-24 Joule meter/Photon Energy.
The higher the frequency of the EM radiation, the greater the energy of an individual photon.X-rays have far higher frequencies than do radio waves.