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The frequency of a wave is 5 Hz. It refers to (type of wave)

1. ultrasonics
2. microwaves
3. infrasonics
4. radio waves

Correct answer: infrasonics

Solution

Infrasonic waves have frequencies below 20 Hz, so a 5 Hz wave falls in the infrasonic range. Ultrasonics are above 20 kHz, while microwaves and radio waves are electromagnetic waves classified by much higher frequency ranges.

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