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The eyes of certain member of the reptil...

The eyes of certain member of the reptile family pass a single visual signal to the brain when the visual receptors are struck by photons of wavelength `850nm`. If a total energy of `3.15xx10^(14)J` is required to trip the signal. What is the minimum number of photons that must strike the receptor?

Text Solution

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The correct Answer is:
`1.35xx10^(5)`
`E=(hL)/(lambda) " "n=(3.15xx10^(-14)xx850xx10^(-9))/(6.62xx10^(-34)xx3xx10^(8))`
`n=134.8xx10^(3)" "n=1.35xx10^(5)`
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