1, acoustics in medical applications
Acoustics has a wealth of physical laws, ultrasound is one of them, ultrasound frequency in 20,000 H2-35 trillion H2 ultrasound used in medical practice A super, B super, M super. Ultrasound emission principle is the same as radar using alternating current emission, can be the body's tissues through its density difference and one by one on the monitor.
2, the transient discharge of electricity in the medical application
Lithotriptic machine using ultrasound principle has been determined in the body of the orientation of the stone, by the high-energy shock waves accurately and quickly broken.
3, laser, X-ray application in medical practice
CT is the use of electronic computer scanning and the use of X-rays of fluorescence, after the computer's processing of the image obtained by the instrument and then derived from the photograph.
The nature of physics
1, truth: theories and experiments in physics reveal the mysteries of nature, reflecting the objective laws of material movement.
2, harmony and unity: Newton used the three laws and the law of gravity to unify all macroscopic objects in heaven and on earth. Maxwell electromagnetic theory of the establishment of electricity and magnetism to achieve unity. Einstein's mass-energy equation unified mass and energy. Einstein's theory of relativity again unified time and space.
3, symmetry: physics of various crystals in space point structure has a high degree of symmetry. Vertical upward motion, simple harmonic motion, fluctuation mirror symmetry, magneto-electric symmetry, symmetry of action and reaction forces, positive and negative electricity.
4, predictive: Maxwell's electromagnetic theory predicts the existence of electromagnetic waves, Rutherford predicted the existence of neutrons, Fresnel's theory of diffraction predicts a Poisson bright spot in the center of the disk diffraction, Dirac predicted the existence of electrons.
5, subtlety: the ingenuity of the design method makes the physical phenomena more obvious.