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.
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4.9695 nm
There is no "measurement of light". The units used depend on what you want to measure: its speed, frequency, wavelength, energy per photon, etc.
Because the wavelength is not 1050 metres but 1050 nanometres.
Yes, given the right conditions. Photons are affected by gravity.
The energy of a basic unit of electromagnetic energy, the photon, is related directly to its frequency by a scaling factor called Planck's Constant, and the equation is often written e = Hf where e is energy unit, H is Planck's Constant and f is frequency unit.