"Ultrasonic speed" isn't a single speed. It refers to sound waves with frequencies above the range of human hearing, which is typically considered to be above 20 kHz.

Here's why it's not a single speed:

* Sound speed depends on the medium: The speed of sound varies depending on the material it travels through. For example:

* Air: About 343 meters per second (767 mph) at room temperature.

* Water: About 1,482 meters per second (3,315 mph) at room temperature.

* Steel: About 5,960 meters per second (13,300 mph) at room temperature.

* Frequency affects speed slightly: While the difference is usually negligible, sound waves at higher frequencies do tend to travel slightly faster in some materials.

Therefore, to determine the speed of an ultrasonic wave, you need to know the specific medium it's traveling through.