Oxygenated hemoglobin absorbs weakly in the red(hence its red color) and strongly in the near infrared,whereas deoxygenated hemoglobin has the opposite absorption.This fact is used in a “pulse oximeter” to measure oxygen saturation in arterial blood. The device clips onto the end ofa person’s finger and has two light - emitting diodes—a red(660. nm) and an infrared (940. nm)—and a photocell thatdetects the amount of light transmitted through the fingerat each wavelength. (a) Determine the frequency of each ofthese light sources. (b) If 67% of the energy of the red sourceis absorbed in the blood, by what factor does the amplitude ofthe electromagnetic wave change?
Oxygenated hemoglobin absorbs weakly in the red
(hence its red color) and strongly in the near infrared,
whereas deoxygenated hemoglobin has the opposite absorption.
This fact is used in a “pulse oximeter” to measure oxygen
saturation in arterial blood. The device clips onto the end of
a person’s finger and has two light - emitting diodes—a red
(660. nm) and an infrared (940. nm)—and a photocell that
detects the amount of light transmitted through the finger
at each wavelength. (a) Determine the frequency of each of
these light sources. (b) If 67% of the energy of the red source
is absorbed in the blood, by what factor does the amplitude of
the
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