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Oxygenated hemoglobin absorbs weakly in the red (hence its red color) and strongly in the near infrared, while 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 (680 nm) and an infrared (965 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 66% of the energy of the red source is absorbed in the blood, by what factor does the amplitude of the electromagnetic wave change?
The string will break if its tension exceeds 50-{rm N}. The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed. Find out the maximum speed the stone can attain without breaking the string.
An 86 Kg person stands on a uniform ladder 4m long, that weighs 70N. The floor is rough; hence, it exerts both a normal force, and a frictional force, on ladder. The wall, on the other hand, is frictionless; it exerts only the normal force. What a..
A tank of water sits at the edge of a table of height 2m. The tank springs a very small leak at its base, and water sprays out a distance of 1.4 m from the edge of the table. What is the water level h in the tank? (Assume the tank is open to the a..
Five people are playing tug-of-war. Anders and alyson pull to the right with 44 N and 34 N, correspondingly. Calid and Marisol pull to the left with 55 N and 35 N, respectively. With what force and in what direction does Benito pul of the game is tie..
Two astronauts, each having a mass M, are linked by a rope of length d having negligible mass. They are isolated in space, orbiting their center of mass at speeds v.
express the magnitude of the applied horizontal force.
What angle does the rope make with the horizontal.
A wooden raft has a mass of 67 kg. When empty it floats in water (density 1000 kg/m3) with 51 percent of its volume submerged. What mass of sand can be put on the raft without it sinking.
An Oscilloscope grid is calibrated so that one square represents 1-V vertically and 1 msec horizontally. If the height of a square wave pulse display is 6 squares, the width of the pulse is 7 squares, and the cycle of the wave is 16 squares, the a..
If the football has the mass of .420 kg and the time of contact with the ball is .014 s, what is the force exerted by the ball on a kicker's foot.
On a cool morning, when the temperature is 16 deg Celsius, you measure the pressure in your car tires to be 20.0 psi. After driving 40 mi on the freeway, temperature of your tires is 56.0 deg Celsius. What pressure will your tire gauge now show.
It compresses the spring, and then is pushed back in the opposite direction by the spring, eventually losing contact with the spring.
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