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Vega has magnitude m = 0 . The flux from Vega at visible wavelengths ( 5 5 0 nm ) has been measured as 3

Vega has magnitude m=0. The flux from Vega at visible wavelengths (550 nm) has been measured as 3.64 x 10-9 W m-2.(To be precise, this is the flux over the wavelength range 450-650 nm, but we will assume it has a single wavelength). How many photons per second per square meter do we receive from Vega?

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