Question
Asked Sep 25, 2019
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The retina of a human eye can detect light when radiant energy incident on it is at least 4.0×10−17 J.

For light of 595−nm wavelength, how many photons does this energy correspond to?

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Expert Answer

Step 1

Given,

 

Total energy is 4.0×10-17 J.

Wavelength of the incident light is 595-nm.

 

Energy of one photon can be calculated as:

 

hc
E=
E energy
h-plank's constant
c=velocity of light
=wavelength of light
6.62x1034 Js x3x10° m/s_3.337x10-19
595x10-9m
E =
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hc E= E energy h-plank's constant c=velocity of light =wavelength of light 6.62x1034 Js x3x10° m/s_3.337x10-19 595x10-9m E =

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Step 2

Number of photons...

4.0x10-17
3.337x10-19l19.86 120 photons
n
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4.0x10-17 3.337x10-19l19.86 120 photons n

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