1. Sound waves traveling through air have a frequency hertz. The sound waves are 1.3 m in length. What is the speed of of 250 sound in air? 2. Water waves in a small tank are 6 cm long. They pass a given point at the rate of 4.8 waves per second. What is the speed of the water waves ? 3. What is the period of the waves in Problem 2?

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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.