4l: Provide examples of how binary digits are physically represented in digital devices.

Binary Data
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bitan individual binary digit
laserlight and sound emitting radiation (a focussed beam of light)
magnetic surfacecovering of a spinning platter inside a hard disk drive which represents 1s and 0s by flipping the polarity of tiny magnetic areas
NAND gatelogic gate used in solid state storage devices to represent 1s and 0s
pits and landsbumps on a CD, DVD or BLU-RAY disc which absorb or reflect laser light so it can be detected by a sensor as 1s and 0s
polaritythe direction of a magnetic or electric field
sensora device that can detect something and turn it into an electrical signal
transistordigital switches used to process electrical signals which represent 1s and 0s
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