Question

( begin{aligned} E &=frac{h c}{lambda} &=frac{6.68 times 10^{-34} times 3 times 10^{8}}{850 times 10^{9}} &=0.02338 times 10^{-17} &=2.34 times 10^{-19} mathrm{J} text { No. of } & begin{aligned} text { photons } & text { exprestal energy } &=frac{3.15 times 10^{-14}}{2.34 times 10^{-19}} &=1.35 times 10^{5} text { photons. } end{aligned} end{aligned} )

# JMC Sllucture & Nuclear Chemistry The eyes of a certain member of the reptile family pass a visual signal to the brain when the visual receptors are struck by photons of wavelength 850 nm. If a total energy of 3.15 x 10-14 J is required to trip the signal, what is the minimum number of photons that must strike the receptor? (h = 6.6 x 10-4)

Solution