Sound waves of wavelength greater than that of the audible sound are called
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by the defenition it is
Ultra sonic sound
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Ultrasonic sound wave
Explanation:
Infrasonic waves are the waves having frequency less than 20 Hz while ultrasonic waves are the wave having frequency more than 20 kHz. The frequency range of a normal person or the audible range is from 20 Hz to 20 kHz. We know that the frequency and wavelength have inverse relation. Infrasonic waves have frequency less than audible range. So, it will have a wavelength greater than that of the audible sound.
Hence, the correct answer is ultrasonic sound wave.
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Sound waves
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