Suppose J energy is needed by the interior of the human eye to see an object

PHYSICS · Subjective · A Level · Physics · Particles and radiation · Particles and radiation

Problem

Suppose

3.1 \times 10^{-18}

J energy is needed by the interior of the human eye to see an object. How many photon of light of

\lambda = 400

nm will be needed to see the object? (

h = 6.6 \times 10^{-34}

Js)