Question

Sound travels through human tissue at 1540 m/s. What frequency is required to create a sound wave with a wavelength of 7.52 * 10^ -5 m

Answer 1

Frequency = (speed) / (wavelength)

Frequency = (1540 m/s) / (7.52 x 10⁻⁵ m)

Frequency = 20.48 MHz

That frequency is more than 1,000 times higher than anything our ears can hear.  That's why it's called "Ultra-sond".