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D- Ultrasonic wave Heating
These waves are different from electromagnetic waves . It produces mechanical vibration inside tissue. It is the same as the sound waves but it has much higher frequencies about I MHz with power of several watts per centimeter. It can move the tissue particles backward and forward with high frequency, in doing so it can increase the kinetic energy consequently it heats the tissue.
Ultrasound can be produced by special transducers placed in direct contact with the skin. It is used for relieving tightness and scarring occurring in jointdisease. It can dispose more heat in bones, as bones are better absorber for ultrasonic energy than soft tissue. It is also used in deep therapy.
Calculate the luminosity for a beam of protons of 1uA colliding with a stationary liquid hydrogen target 30cm long. Compare this to a typical colliding beam luminosity of 10e34 cm-
1. The probability of dissociation of water into H + and OH - , to a good approximation, can be characterized by the Boltzmann distribution: W ≈ e -Eα/ KT If, at 27°C, 1.
Eotvos law of capillarity (Baron L. von Eotvos; c. 1870): The surface tension gamma of liquid is associated to its temperature T, the liquid's critical temperature, T*, & its
1. There are 40 such microwave hops in tandem. What is the end-to-end C/N of the link? 2. Assume now that these 40 hops are replaced by a single satellite hop as shown below.
The magnetic field B inside a solenoid, having a current of 5 A, is 3.14 X 10 -2 T. Determine the number of turns per unit length of the solenoid.
Alfonso and Sarah like to go sky diving together. Alfonso has a mass of 88 kg, and Sarah has a mass of 66 kg. While in free fall together, Alfonso pushes Sarah horizontally with a
A football player kicks a field goal from a distance of 45 m from the goalpost. The football is launched at a 35° angle above the horizontal. What initial velocity is neede
why soft iron is used in earphone
Transformer cores are laminated with (A) Low carbon steel. (B) Silicon sheet steel. (C) Nickel Alloy steel. (D) Chromium sheet steel. Ans: Transformer co
Since pure iron is limited because its high eddy current losses, by incorporating small quantities of other elements in iron good magnetic properties are obtained. The chief alloyi
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