In the application shown below, sound from the speaker divides into two equal parts that recombine at the receiver. Note that the path length of sound may be varied in the top part by means of the sliding section. The speed of sound is 343 mis and the frequency of sound emitted by the speaker is 536 Hz. If constructive interference occurs at a particular location of the sliding section, by what minimum amount (in m) should the slider be moved upward so that the destructive interference occurs instead? Sliding section ----- --- Receiver

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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.