Light of wavelength 3000 Å falls on a se...

Light of wavelength 3000 `Å` falls on a sensitive surface. If the surface has received `10^-7` J of energy, then number of photons just falling on the surface area

`1.5 xx10^6`

`1.5 xx10^11`

`1.5 xx10^3`

`2.5 xx10^11`

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