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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.
Transistor: An active semi-conductor device with three terminals that is emitter base and collector is known as transistor. Types of Transistor: There are two types of
Two arrows are fired horizontally with the same speed of25.0 m/s. Each arrow has a mass of0.116 kg. One is fired due east and the other due south. Find the magnitude and direction
KINEMATIC CHAIN : Refers to an assembly of rigid bodies connected by joints that is the mathematical model for a mechanical system. As in the familiar use of the word chain, the ri
(i) A matter pulse is not electromagnetic in behavior. (ii) Practical observation of matter waves is possible only when the de-Broglie wavelength is of the order of the size of
Phenomenon of resonance At resonance, rapid transfer of energy takes place resulting louder sound (booming sound). If two bodies having same natural frequency is placed side b
A wooden ring stand The bottom for this ring stand is made from a piece of wood 40 cm long, 15 cm wide and 1 cm thick. A whole 1 cm in diameter is bored by the centre of the ba
A car of mass 800 kg is pulling a trailer of mass 300 kg up the slope of angle ? to the horizontal where sine ? = 1/200. Resistance to motion (apart from gravity) is 1.5 N per kg o
If a great point-mass is removed by a weightless, inextensible and perfectly flexible string from a rigid support, then this arrangement is known as a simple pendulum.
What are capacitors used for in induction coils
What is the net force on a conductor of length l carrying current 'i' when it is situated in a magnetic field of induction B? When is it maximum? State and explain Fleming's l
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