The human eye is most sensitive togreen light of wavelength 505 nm. Experiments have found that whenpeople are kept in a dark room until their eyes adapt to the darkness, asingle photon of green light will trigger receptor cells in the rods of theretina. (a) What is the frequency of this photon? (b) How much energy(in joules and electron volts) does it deliver to the receptor cells? (c) Toappreciate what a small amount of energy this is, calculate how fast atypical bacterium of mass 9.5 * 10^-12 g would move if it had that muchenergy.
The human eye is most sensitive togreen light of wavelength 505 nm. Experiments have found that whenpeople are kept in a dark room until their eyes adapt to the darkness, asingle photon of green light will trigger receptor cells in the rods of theretina. (a) What is the frequency of this photon? (b) How much energy(in joules and electron volts) does it deliver to the receptor cells? (c) Toappreciate what a small amount of energy this is, calculate how fast atypical bacterium of mass 9.5 * 10^-12 g would move if it had that muchenergy.
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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. (a) What is the frequency of this photon? (b) How much energy
(in joules and electron volts) does it deliver to the receptor cells? (c) To
appreciate what a small amount of energy this is, calculate how fast a
typical bacterium of mass 9.5 * 10^-12 g would move if it had that much
energy.
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