Suppose 10^–18J of light energy is needed by the interior of the human eye to see an object. The number of photons of green light ( $λ$ = 550nm) are needed to generate this amount of energy is A.BC,the value of it is

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answer is 2.77.

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Detailed Solution

$E_{photon} = n . \frac{hc}{λ} = n . \frac{6 .625 \times 10^{- 34} \times 3 \times 10^{8}}{550 \times 10^{- 9}} = 2.77$
$= 3 .61 \times 10^{- 19} J = 1 photon$

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