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Attenuation of Ultrasound. Ultrasound is absorbed in the body; this complicates the use of ultrasound to image tissues. The intensity of a beam of ultrasound decreases by a factor of 2 after traveling a distance of 40 wavelengths. Each additional travel of 40 wavelengths results in a decrease by another factor of 2. Assume speed of ultrasound in human tissue v = 1540 m/s.
A beam of 2.5 ultrasound begins with an intensity of 2000. After traveling 10 through tissue with no significant reflection, the intensity is about
A physician is making an image with ultrasound of initial intensity 2000 W/m^2. When the frequency is set to 2.5 MHz, the intensity drops to 1000 W/m^2 at a certain depth in the patient's body. What will be the intensity at this depth if the physician changes the frequency to 5.0 MHz?
If the coefficient of friction between road and tires on a rainy day is 0.120, what is the minimum distance in which the car will stop.
A spelunker is surveying a cave. He follows a passage that goes 181 m straight west, Use a scale drawing to determine the fourth displacement
Two in-phase loudspeakers are located at (x, y) coordinates (-2.5 m, +2.0 m) and (-2.5 m, -2.0 m), Determine the amplitude of the sound at the five positions on the y-axis (x = 0) with y = 0.0 m, 0.5 m, 1.5 m, and 2.0 m
The car that hits a concrete barrier and takes 0.3 seconds to stop.
The block is spun at 50 , then the temperature of the rod is slowly increased. When the wax melts, the block slides out to the end of the rod. Illustrate what is the final angular velocity?
A mirror that is spherical has a focal length of -15 cm. what type of image would it be, What is the magnification going to be
Two point charges q1= 5.00x10^-6C and q2= -3.0x10^-6C are located on x-axis at x1= -0.4m and x2=0.6m, Find the electric field and the electric potential at the origin
Bicyclists in the Tour de France reach speeds of 34.0 miles per hour (mi/h) on flat sections of the road. What is this speed in meters per second
Argon is a monatomic gas whose atomic mass is 39.9 u. The temperature of eight grams of argon is raised by 71 K under conditions of constant pressure. how much heat is required
With the switch open the ammeter reads 1.00 A. What is the resistance of resistor R2 to an appropriate precision and what is the potential difference across R2 when the switch is open?
At its highest temperature, a space heater has a resistance of 15.5 ?, What is the average power output of the space heater
How many half-lives are required for the number of radioactive nuclei to decrease to 1/10^5 of the initial number
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