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1) Expectant mothers many times see their unborn child for the first time during an ultrasonic examination. In ultrasonic imaging, the blood flow and heartbeat of the child can be measured using an echolocation technique similar to that used by bats. For the purposes of these questions, please use 1500 m/s as the speed of sound in tissue. To clearly see an image, the wavelength used must be at most 1/4 of the size of the object that is to be imaged. What frequency is needed to image a fetus at 8 weeks of gestation that is 1.6 cm long?
2) Blood flow rates in the umbilical cord can be found by measuring the Doppler shift of the ultrasound signal reflected by the red blood cells. If the source emits a frequency f, what is the measured reflected frequency ? Assume that all of the red blood cells move directly toward the source. Let c be the speed of sound in blood and v be the speed of the red blood cells. Give your answer in terms of f, v and c.
3a) A laser beam has intensity 0 . What is the intensity, in terms of 0, if a lens focuses the laser beam to 1/10 its initial diameter?
3b) The wave speed on a string under tension is 140 m/s. What is the speed if the tension is doubled?
The well-mixed, constant-volume chemical reactor with separator and re cycle in Figure is considered in this question.
There's an office door, 0.86m wide, 2.0m high and 4.0cm thick. It pivots on frictionless hinges. What is the least force that you need
A toddler, initially standing next to his father in the front yard, walks slowly away from his dad in the direction of 30.0? N of E for 3.50 meters. How far was the distance he walked due south
The measurement of the energy of a photon requires a timeinterval of 3.6 x 10-8 sec. What is the smallest uncertainty in the photon's energy
When winter arrives, the towers stay the similar distance apart and the bridge deck keeps the similar shape as its expansion joints open. When the temperature drops to -10.0°C, what is the tension in the wire? Take Young's modulus for steel to be ..
As observed on earth, a certain type of bacterium is known to double in number every 6 hours. how many bacteria are in the culture on the rocket, according to an earth-based observer
At what position (other than infinitely remote ones) can the 47.0-kg object be placed so as to experience a net force of zero?
Laboratory in your city accidentally released some radioactive gas
The cross-sectional area of region A in the pipe is 1.05m^2, and the cross-sectional area of region B in the pipe is 0.740m^2. What is the speed of the water in region A of the pipe
A wheel rotates with a fix angular acceleration of 3.80 rad/s^2. Determine the angle in which the speed rotates between t=2.00 sec and t=3.60 sec
Cliff and Will support the board at each end so that it is horizontal. A 61 kg boulder is placed on a 2.00 m long board at a point that is x from Cliff. What is the displacement x of the boulder from Cliff
A string 2.0 m long is held fixed at both ends. If a sharp blow is applied to the string at its center, What are the lowest three standing wave frequencies for this string
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