From the figure below, approximate the (a) smaller and (b) larger wavelength (in

Question

From the figure below, approximate the (a)smaller and (b) larger wavelength (in nm) at whichthe eye of a standard observer has half the eye's maximumsensitivity. What are the (c) wavelength,(d) frequency (in Hz), and (e)period (in s) of the light at which the eye is the mostsensitive?

From the figure below, approximate the (a)smaller and (b) larger wavelength (in nm) at whichthe eye of a standard observer has half the eye's maximumsensitivity. What are the (c) wavelength,(d) frequency (in Hz), and (e)period (in s) of the light at which the eye is the mostsensitive?

Explanation / Answer

From the problem, we get by drawing a horizontalline from "50 sensitivity" on the graph, it intersects at a) 515nm And b) 610nm c) "100 sensitivity" occurs at 555nm d) The frequency is given by              c = f           3x108 =555x10-9 * f Or,         f = 5.41x1014 Hz e)   The time period is       T=1/ f          =1/ (5.41x1014 Hz)          =1.85x10-15 s      

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