Question

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 (653 nm) and an infrared (906 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.

red	Hz
infrared	Hz

(b) If 62% of the energy of the red source is absorbed in the blood, by what factor does the amplitude of the electromagnetic wave change? Hint: The intensity of the wave is equal to the average power per unit area as given by I =

Emax2

2μ0c

=

c

2μ0

B_max².

Answer 1

2 = 3x100 ml 6598109 = 4.59x10'4 Hz (a) = 1 3x108m 18 33) X10HZ infrared & . 906x150 m 1x Er E = 10.62 It deeress amplitude. En = 0.787 Em becomes 0.787 times of initial