claim: Levoamphetamine improves the ability to focus on tasks.
evidence: The X band is a segment of the microwave radio region of the electromagnetic spectrum .. microwave. microwave. radio. radio. electromagnetic spectrum. electromagnetic spectrum. In some cases , such as in communication engineering , the frequency range of the X band is rather indefinitely set at approximately 7.0 to 11.2 GHz .. GHz. GHz. communication engineering. communication engineering. frequency. frequency. In radar engineering , the frequency range is specified by the IEEE at 8.0 to 12.0 GHz .. GHz. GHz. frequency. frequency. radar. radar. IEEE. IEEE