1.) It is used to generate and transmit EM waves
2.) the visible or invisible radiation emitted by certain substance as a result of incident radiation
3.) obstruct
4.) turns the wheel
2.) the visible or invisible radiation emitted by certain substance as a result of incident radiation
3.) obstruct
4.) turns the wheel
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Answer:
1. Electromagnetic waves
2.RADIATION
3. Block or close up by an obstacle A piece of food obstructed his airway.
4. If you say that the wheels turn in a process or situation, you mean that progress is made.