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1.
S₁: The coming of the computer sparked the need for remotely operatecl controls.
S₆: The code is based on binary digits.

P: It is silicon chip that is at the heart of the remote control.
Q: This produces an infra-red beam, which is made up of electromagnetic waves.
R: When you press the button on the remote control, the chip sets off an electronic vibration.
S: The beam carries a coded signal such as switch on, raise volume, etc.