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Among the following, which type of wave has the lowest frequency?

1. Microwaves
2. Audible waves
3. Ultrasonic waves
4. Radiowaves

Correct answer: Audible waves

Solution

Audible waves span about 20 Hz to 20 kHz, far below radio waves (kHz-GHz), microwaves (GHz) and ultrasonic (>20 kHz). The lowest frequency is therefore audible waves.

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