Consider an omnidirectional mobile robot with a ring of twelve ultrasonic sensors (each with an opening angle of 30o) that are fired sequentially. Calculate the slowest scan rate in Hz (i.e. number of full 360o scans per second) if the furthest object of interest is 4m away at any given time. Give your answer to 2 decimal places. Assume the speed of sound in air is 343 m/s.

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Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.