Because you don't have a steady stream of carbs to fuel your brain. Protein at meals helps time-release the carbs for steady energy rather than up and down spikes. If you're relying only on fleeting foods, such as crackers or bread, you'll only experience short bursts of mental energy, followed by the fog.
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Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of targets in the water. Acoustic location in air was used before the introduction of radar. Sonar may also be used in air for robot navigation, and SODAR (an upward looking in-air sonar) is used for atmospheric investigations. The term sonar is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low (infrasonic) to extremely high (ultrasonic). The study of underwater sound is known as underwater acoustics or hydroacoustics.