Rhodopsin is the pigment in the retina rod cells responsible for vision, and it

Question

Rhodopsin is the pigment in the retina rod cells responsible for vision, and it consists of a protein and the co-factor retinal. Retinal is a Pi-conjugated molecule which absorbs light in the blue-green region of the spectrum. Absorption of the photon results in retinal undergoing a transition from the ground state to the lowest excited state. (a) If the absorption occurs at roughly 500 nm, what is the energy of the transition in Joules? (b) At physiological standard temperature, 37degreeC, what is the value of the partition function? (c) Before interaction with light, what would be the fraction of the population of the excited state? (d) How would vision be affected if the energy gap were much, much smaller? (e) How would vision be affected if the energy gap were much, much bigger?

Explanation / Answer

a>E=hc/L

E=6.626x10^-34x3x10^8/500x10^-9

E=3.9756x10^-19j

b>partion function is arelative value it is not given for a perticular temp.

Z=sumation e^-E/T

P(Es)=e^-Ez/T/Z

c>before absorbtion of energy there is no any excited state

d>vision is not clear

e>higher energy light is required for vision

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