2. What is the sound intensity level L in decibels of ultrasound of intensity I =10$ W/m² used to pulverize bone tissue during surgery? Find amplitude of tissue particles vibration under the action of such ultrasound, if frequencyf = 1 MHz (speed and density take from the table).

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.