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6. -/4 points series of impulses that eventually reach the brain The human eye is a complex ensing device for visible light.
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Answer #1

A)

Given:

lambda = 690 nm = 6.90*10^-7 m

1st calculate energy of 1 photon

use:

E = h*c/lambda

=(6.626*10^-34 J.s)*(3.0*10^8 m/s)/(6.9*10^-7 m)

= 2.881*10^-19 J

number of photon = total energy/energy of 1 photon

n = 2.0*10^-17/2.881*10^-19

= 69.42

Answer: 69

B)

Given:

lambda = 475 nm = 4.75*10^-7 m

1st calculate energy of 1 photon

use:

E = h*c/lambda

=(6.626*10^-34 J.s)*(3.0*10^8 m/s)/(4.75*10^-7 m)

= 4.185*10^-19 J

number of photon = total energy/energy of 1 photon

n = 2.0*10^-17/4.185*10^-19

= 47.79

Answer: 48

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