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The attenuation (intensity loss) of ultrasound in tissue is approximately 0.3 dB per MHz per cm of depth. (E.g., a 3 MHz signal travelling during 2 cm of tissue has its initial intensity reduced by 0.3×3×2 = ?1.8 dB.) About how deep into the tissue 10.5 MHz transducer probes before the intensity can is reduced to one eighth of its initial value? Suppose a decrease of 3 dB corresponds to a halving of intensity.
Give your answer in centimetres to one important figure. (Don't enter unit.) Note: Though a formula can be utilized, the required accuracy does not demand it.
A beam of 12 cm microwaves strikes a surface glass with an index of 1.5 at an incident angle of 45 degrees. Compute the transmitting angle
A resistance of ohms ,an inductive reactance of 8 ohms and capacitive reactance of 15 ohms are connected in parallel across 120V, Find total current , power factor
A beam of light is incident in air with an incident angle 56 degrees. calculate the index of refraction of this unknown liquid
Your 2.20 kg physics book rests on a horizontal tabletop. Find the normal force on the book. Suppose you pull up on the book with a 15.0 N force
In the figure below, the converging lens' focal length is 13 cm, d = 18 cm, and the diverging lens' focal length is -12.6 cm, How tall is the image formed by the diverging lens
A student tries to raise a chain consisting of three identical links. Each link has a mass of 240 gram. Determine the acceleration of the chain
After a completely inelastic collision, two objects of the same mass and same initial speed are found to move away together at 1/2 their initial speed
A bob of mass = 0.300 is suspended from a fixed point with a massless string of length = 25.0. What tangential speed must the bob have so that it moves in a horizontal circle with the string making an angle 21.0 with the vertical
A 200?F defibrillator capacitor is charged to 1500 V.When fired through a patient's chest, it loses 95% of its charge in 40 ms
On a frictionless horizontal air table, puck A (with mass 0.253kg ) is moving toward puck B (with mass 0.365kg), which is initially at rest. After the collision, puck A has velocity 0.115m/s to the left, and puck B has velocity 0.655m/s to the right...
Hello Since a prop-airplane can remain in horizontal flight indefinitely, why then, in the air shows, when the airplane is pointing vertically upward
Two converging lenses, the first by focal length 10.0 cm and the second with focal length 20.0 cm, are separated by 40.0 cm. An object, 3.00 cm in height, is placed 30.0 cm in front of the first lens. Where is the final image formed?
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