"Man-made" noise can come from:

equipment that sparks

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temperature

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static

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all of the above

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Solution

The correct option is A equipment that sparks
Man-made noise is a noise created due to wear and tear of electrical machinery used in transmission systems. They are due to the type of amplifiers (class B) type of pulses (wideband pulses), often caused by ignition circuits, lightning, and switching elements causing spark gaps

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