Afairly new technology that uses radio signals to send and receive information is referred to as

a. mar.
b. rfid.
c. gui.
d. barcoding.

B. RFID.

Explanation:

Radio Frequency Identification (RFID) is designed to replace conventional barcode scanning. Bar code reading requires the reader's approach to the code, with exact angle and interpretation time. Basically it is the same used in supermarkets and various stores.

RFID reading technology utilizes short-range communication that can be automatically read by sensors when passing the RF tag carrier. Same task more efficiently, less time and greater accuracy. That is, this technology allows radio signals to send and receive information.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.