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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.
A radioactive substance has a half life of 1 min. If one nuclei decays now , when will be next decay????
If the velocity of the box in problem 10 was 5.0 m/s at time zero, what will be its speed after 0.50 s? How far will it travel in that time interval?
a loaded trunk weighs 80 kn and accelerates uniformly on a level road from 4.5m/s to 9m/s during 4s.if the frictional resistance to motion is 1.625kn , determine the maximum power
Conventional Current: Earlier scientists had no knowledge of the concept of electron, so the developed the convention, still in use, , that the direction of current is for appo
What are single ends? The extreme fiber optics conductor is farthest from the illuminator. The bit which emits light or the end that lights up.
A 50.0-g toy car travelling with a velocity of 3.00 m/s due north collides head-on with a 180.0-g fire truck travelling with a velocity of 0.50 m/s due south. The toys stick to
Plane and The Package Suppose a plane moving along with a constant speed at an elevated height above the Earth's surface. Within the course of its flight, the plane drops a pac
Given a particle moving along a straight line with fixed acceleration a. Let u be the initial velocity of the particle and v be the velocity at time t. So by definition,
what is dielectric polarisation
State perpendicular axis theorem. a) Explain impulse-momentum principle. b) Verify the equation of motion for translation
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