the eye of the reptile!

Electricity and Magnetism Level 2

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?


  • 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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