The frequency of ultrasound waves is
[amp_mcq option1=”less than 20 Hz” option2=”between 20 Hz and 2 kHz” option3=”between 2 kHz and 20 kHz” option4=”greater than 20 kHz” correct=”option4″]
This question was previously asked in
UPSC NDA-2 – 2018
– Sound waves with frequencies below 20 Hz are called infrasound.
– Sound waves with frequencies above 20 kHz are called ultrasound.