The eyes of a certain member of the reptile family pass a visual signal to the brain when the visual receptors are struck by photons of wavelength 850 nm. If a total energy of 3.15×10–14 J isrequired to trip the signal, the minimum number of photons that must strike the receptor is x×105photons, find x. (h=6.6×10–34 J s). Report the value upto two decimal.
We know that, Total energy=n×Energy of one photon
Energy of one photon=hcλ
∴3.15×10–14 J=n×(6.6×10–34 J s)(3×108 m/s)850×10–9 m