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The eyes of a reptille pass a visual s...

The eyes of a reptille pass a visual signal to the brain when the visual receptors are struck by photons of wavelength `859` nm. If an energy of `3.15 xx 10^(-14) J` is required to trip the signal, what is minimum number of photons that must strike the receptor `(h = 6.6 xx 10^(-34))`?

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`1.37 xx 10^5` photon,
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P BAHADUR-ATOMIC STRUCTURE-Exercise 9
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