# the eye of the reptile!

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 132.6 nm. If a total energy of $$3\times 10^{-14}$$ J is required to trip the signal, what is the minimum number of photons that must strike the receptor?

Constants

• Plank's constant, $$h = 6.63\times 10^{-34}\text{ J}\cdot\text{s}.$$
• Speed of light, $$c = 3\times 10^{8}\text{ m/s}.$$
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