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# Ultrasound has a frequency of vibration-$\left( a \right)$ Between $20Hz$and $20000Hz$$\left( b \right) Below 20Hz$$\left( c \right)$ Above $20000Hz$$\left( d \right)$ Between $500Hz$and $10000Hz$

Last updated date: 19th Sep 2024
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Complete Step by Step Solution Human ears can't detect sound frequencies under twenty vibrations for each second for example $20Hz$ for every second. Thus, any vibration underneath that recurrence will be indistinct to people. The human ear can't detect frequencies over $20000$ vibrations for every second $20Hz$ in the high-frequency range, and the adequacy of the wave will be subject to the sound's clamor. Consequently, the frequencies under $20Hz$ and more than $20kHz$ fall under the indistinct frequencies band. The unintelligible higher frequency range is otherwise called ultrasonic sound.
Subsequently, stable waves having frequency more than $20000Hz$ are called ultrasonic sounds.
Therefore, the option $\left( c \right)$will be correct.