The eyes of a reptille pass a visual signal to the brain when the visual receptors are struck by photons of wavelength 850nm. If a total energy of 3.15×10 −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))`?

Explanation

To solve the problem, we need to find the minimum number of photons that must strike the receptor to provide the total energy required to trip the visual signal.

### Step-by-Step Solution:

1. **Identify the given data:**
- Wavelength of the photon, \( \lambda = 850 \, \text{nm} = 850 \times 10^{-9} \, \text{m} \)
- Total energy required, \( E_{\text{total}} = 3.15 \times 10^{-14} \, \text{J} \)
- Planck's constant, \( h = 6.63 \times 10^{-34} \, \text{J s} \)
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