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Suppose 10^(-17)J of light energy is nee...

Suppose `10^(-17)J` of light energy is needed by the interior of the human eye to see an object. How many photons of green light `(lambda=550nm)` are needed to generate this minimum amount of energy?

Text Solution

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The energy needed to see object `=10^(-17)J`
Photon energy used to see object `=(hc)/(lamda)`
`=(6.626xx10^(-34)xx3.0xx10^(8))/(550xx10^(-9))`
`=3.61xx10^(-19)`J/photon
`:.` Number of photons `=(10^(-17))/(3.61xx10^(-19))=27.7`
`:.` Minimum number of photons required to see object =28
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