The human eye can just detect green light of wavelength $500 \mathrm {~nm}$ if it arrives at the retina at the rate of $2 \times 10 ^ { - 18 } \mathrm {~W}$. How many photons arrive each second? $\left( c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = \right.$ $\left. 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

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The Answer of The human eye can just detect green light of wavelength $500 \mathrm {~nm}$ if it arrives at the retina at the rate of $2 \times 10 ^ { - 18 } \mathrm {~W}$. How many photons arrive each second? $\left( c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = \right.$ $\left. 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

The Human Eye Can Just Detect Green Light of Wavelength 500 nm500 \mathrm {~nm}500 nm

The Human Eye Can Just Detect Green Light of Wavelength $500 \mathrm {~nm}$