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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.
Q. Why does the sky appear blue in colour? As-per to the Rayleigh's scattering law the shorter wavelengths are scattered much more than the longer wavelengths. The blue look o
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-
group velocity and phase velocity
Lenz's law (H.F. Lenz; 1835): An induced electric current always pass in such direction that it opposes the change generating it.
Production of electricity by pressure: Certain crystals and semiconductors produce an emf between two opposite faces when the mechanical pressure on them is either increased or
obtain an expression for dipolar polarisability of a dielectric at moderate temperature
Explain Newtons First Law An object will remain at rest or move with constant velocity until acted upon by a net external force. (A non-accelerating reference frame is known
Dulong-Petit law (P. Dulong, A.T. Petit; 1819) The molar heat capacity is around to equal to the three times the ideal gas constant: C = 3 R.
Making a shadow stick In an open space on the school ground drive a 130 cm stick into the ground and let the children stay a record of the length of the shadow, calculated two
define
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