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What is the factor that differentiates an ultrasonic wave from an infrasonic wave?

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Wavelength

Time

Frequency

Velocity

answer is C.

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Detailed Solution

The factor that differentiates an ultrasonic wave from an infrasonic wave is frequency.
Infrasonic sound waves are those with frequencies below

20 Hz

that are audible. For example, volcanoes, earthquakes, and thunder emit sound in the infrasonic range. Elephants and whales can hear this sound, but human ears cannot. Ultrasonic waves are those that are above the frequency of

20, 000 Hz

. Therefore frequency is the deciding factor of differentiation.
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