The human eye contains a molecule called 11-cis-retinalthat changes conformation
ID: 691711 • Letter: T
Question
The human eye contains a molecule called 11-cis-retinalthat changes conformation when struck with light of sufficientenergy. The change in conformation triggers a series of events thatresults in an electrical signal being sent to the brain. Theminimum energy required to change the conformation of11-cis-retinal within the eye is about 164 kJ/mol .Calculate thelongest wavelength visible to the human eye.I tried 700nm but it wasn't right. The human eye contains a molecule called 11-cis-retinalthat changes conformation when struck with light of sufficientenergy. The change in conformation triggers a series of events thatresults in an electrical signal being sent to the brain. Theminimum energy required to change the conformation of11-cis-retinal within the eye is about 164 kJ/mol .Calculate thelongest wavelength visible to the human eye.
I tried 700nm but it wasn't right.
Explanation / Answer
164,000 J / 6.022x10^23 = 2.723x10^-19 J per molecule E = h x freq 2.723x10^-19 = 6.626x10^-34 x freq frequency = 4.11x10^14 Hz wavelength = 3.00x10^8 m s^-1 / 4.11x10^14 = 7.29x10^-7 m 7.29x10^-7 = 729x10^-9 wavelength = 729 nm
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