The human eye is most sensitive to green light of wavelength 505 nm . Experiment
ID: 2175657 • Letter: T
Question
The human eye is most sensitive to green light of wavelength 505 nm . Experiments have found that when people are kept in a dark room until their eyes adapt to the darkness, a single photon of green light will trigger receptor cells in the rods of the retina.1.What is the frequency of this photon?
2.How much energy (in joules and eV ) does it deliver to the receptor cells?
Answer in the order indicated. Separate your answers with a comma.
3.To appreciate what a small amount of energy this is, calculate how fast a typical bacterium of mass 9.5010?12 g would move if it had that much energy.
Explanation / Answer
1)the frequency will be = c/
= 3*108/(505*10-9 )= 5.94*1014 Hz
2) energy = h * frequency = 3.93 * 10-19 joule = 3.93 * 10-19 / (1.6*10-19 ) = 2.45 ev
3) 1/2 m v2 =3.93 * 10-19
m= 9.5*10-15 kg
v from the equation will be = 9.09*10-3 m/s
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