The human eye can detect light intensities as small as, Ask an Expert

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The human eye can detect light intensities as small as about 8 10-23 W/m2.

(a) What is the corresponding electric field amplitude?

_____ N/C

(b) Suppose the eye senses this light by detecting the force on electrons inside a photoreceptor cell within the eye. What is the electric force exerted on an electron by the electric field found in part (a)?

_____N

electric force/weight of electron = _____

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