Oxygenated hemoglobin absorbs weakly in the red (hence its red color) and strong
ID: 1997054 • Letter: O
Question
Oxygenated hemoglobin absorbs weakly in the red (hence its red color) and strongly in the near infrared, whereas deoxygenated hemoglobin hat 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 (644 inn) and an infrared (919 nm)-and a photocell that detects the amount of light transmitted through the finger at each wavelength. Determine the frequency of each of these light sources red _________ Hz infrared _______ Hz If 70% of the energy of the red source is absorbed In the Wood, by what factor floes the amplitude of the electromagnetic wave change? __________ Oxygenated hemoglobin absorbs weakly in the red (hence its red color) and strongly in the near infrared, whereas deoxygenated hemoglobin hat 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 (644 inn) and an infrared (919 nm)-and a photocell that detects the amount of light transmitted through the finger at each wavelength. Determine the frequency of each of these light sources red _________ Hz infrared _______ Hz If 70% of the energy of the red source is absorbed In the Wood, by what factor floes the amplitude of the electromagnetic wave change? __________ Oxygenated hemoglobin absorbs weakly in the red (hence its red color) and strongly in the near infrared, whereas deoxygenated hemoglobin hat 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 (644 inn) and an infrared (919 nm)-and a photocell that detects the amount of light transmitted through the finger at each wavelength. Determine the frequency of each of these light sources red _________ Hz infrared _______ Hz If 70% of the energy of the red source is absorbed In the Wood, by what factor floes the amplitude of the electromagnetic wave change? __________Explanation / Answer
a) for the frequency of the waves
frequency of red wave = speed of light/wavelength
frequency of red wave = 3 *10^8/(644 *10^-9)
frequency of red wave = 4.66 *10^14 Hz
for the infrared light
frequency of infrared wave = speed of light/wavelength
frequency of infrared wave = 3 *10^8/( 919*10^-9)
frequency of infrared wave = 3.26 *10^14 Hz
b)
as energy absorbed = 0.70
as E is proportional to Amplitude^2
Amplitude will increase by sqrt(1.70) = 1.304
the amplitude will increase by 1.304 times
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