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 (659 nm) and an infrared (979 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. Hz Hz red infrared (b) If 63% 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 2 I- Emax 2

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 (659 nm) and an infrared (979 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. Hz Hz red infrared (b) If 63% 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 2 I- Emax 2

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

Answer simple 10 grade
The current that flows through 5Q resistor due to 5 A current source only is equal to
In the Wheatstone bridge experiment shown in 2,2 kn the figure the values of the resistors are R=2.2 k2, R2=4.7 k2, R3=3.3 k2 .Calculate the value of resistor R, when the current in the HA ampere-meter is zero. R2
Problem 9: A current passing through a resistor (R = 25 2) decreases exponentially with time as I(t) = Ioe at where Io = 5.5 A and a = 0.15 s-1. %3D Part (a) Calculate the energy dissipated by the resistor in joules during the first 10 seconds. E = || sin() cos() tan() 7 8 9 НOME E 1^ AL 4 5 6 1 2 3 cotan() asin() acos() atan() acotan() sinh() cosh() tanh() cotanh() + END O Degrees Radians VO BАСKSPАСЕ DEL CLEAR Submit Hint Feedback I give up! Part (b) Calculate the total energy dissipated by the resistor in joules as time goes to infinity.
The capacitor in the circuit shown is fully charged by a 24 V battery. The switch is closed at t = 0. At sometime after the switch is closed, the voltage across the capacitor is measured to be 10 V. What is the current in the circuit at this time, in Ampere? C = 3.0 µF, and R = 2.0 02. Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. Cil
40 A 451+ 3:00 Q1) The resistor has 4 bands. Red , Black, Orange , Gold, then Its value in kN is: Digit Multiplier Tolerance (6) 10 (1) Color Black Brown 10 10 Orange Yellow Careen 0.5 10° 10 Blue 0.25 0.1 Violat Crey White 10 Gold Silver 10 10 a) 200 Q with a 10 0/0 Tolerance b) 20 ka with a 5 0/0 Tolerance c) 2000 Q with a 5 0/0 Tolerance d) 2 kn with a 10 0/0 Tolerance Select one: a. 20 ko with a 5 0/0 Tolerance b. 2 kn with a 10 0/0 Tolerance c. 200 Q with a 10 0/0 Tolerance d. 2000 Q with a 5 0/0 Tolerance
(a) In the figure what value must R have if the current in the circuit is to be 1.2 mA? Take 8 = 1.7 V, E2 = 4.3 V, and r1 = r2 = 2.8 Q. (b) What is the rate at which thermal energy appears in R? (a) Number i Units 4 (b) Number i Units
Energetic particles, such as protons, can be detected with a silicon detector. When a particle strikes a thin piece of silicon, it creates a large number of free electrons by ionizing silicon atoms. The electrons flow to an electrode on the surface of the detector, and this current is then amplified and detected. In one experiment, each incident proton creates, on average, 34,000 electrons; the electron current is amplified by a factor of 100; and the experimenters record an amplified current of 3.5 μA. How many protons are striking the detector per second?
When the current in the portion of the circuit shown below is 2.40 A and increases at a rate of 0.420 A/s, the measured voltage is AVab = 8.85 V. When the current is 2.40 A and decreases at the rate of 0.420 A/s, the measured voltage is AVab = 4.90 V. Calculate the values of L and R. HINT: Use a Kirchhoff loop for each of the two scenarios and then simultaneously solve the two equations. Use the signs as given by Kirchhoff's Rules for the emf in the inductor. L = H R = Ω ll L R a 9,
In a certain article, laser therapy was discussed as a useful alternative to drugs in pain management of chronically ill patients. To measure pain threshold, a machine was used that delivered low-voltage direct current to different parts of the body (wrist, neck, and back). The machine measured current in milliamperes (mA). The pretreatment experimental group in the study had an average threshold of pain (pain was first detectable) at ? = 3.19 mA with standard deviation ? = 1.03 mA. Assume that the distribution of threshold pain, measured in milliamperes, is symmetric and more or less mound-shaped. (Round your answers to two decimal places.) (a) Use the empirical rule to estimate a range of milliamperes centered about the mean in which about 68% of the experimental group will have a threshold of painfrom mA to mA(b) Use the empirical rule to estimate a range of milliamperes centered about the mean in which about 95% of the experimental group will have a threshold of painfrom mA to…
Ct-2:13.37
Question 8. A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of the secondary coil are 24, then the number of turns of the primary are ______.