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Ultrasound has a frequency of vibration
A. Between 20 and 20000Hz
B. Below 20Hz
C. Above 20000Hz
D. Between 500 and 10000Hz

Answer
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Hint: In physics, an acoustic wave that propagates through vibrations through a medium such as solid, liquid, or gas is called sound. The reception or perception of these kinds of waves by the brain is called sound according to human physiology. Human ears can perceive up to a particular range of frequency.

Complete step by step answer:
Human ears can receive up to a particular range of sounds. The range of frequency lying between 20Hz and 20000Hz is perceivable to humans. Sounds that have a frequency greater than 20000Hz are called ultrasonic sounds. Some animals can hear ultrasonic sounds. Dogs can hear sounds greater 20000Hz than but humans cannot hear such sounds. The frequency range that dogs can hear varies from 6745000Hz. The frequency that lies between 20000Hz and 45000Hz can be heard by dogs but not by humans.

Hence, the correct answer is option (C).

Additional Information:
The sounds that have a frequency less than 20Hz are called infrasound. This range of sounds is additionally inaudible to humans. The capacity of perception varies in several animal species. For different purposes like predation, detection of danger, communication, navigation, etc. Many animals use sounds. Some animals have special organs to produce sounds. Animals like whales, animals, etc. can detect infrasound and use it for communication. Unwanted sound is called noise.

Note: Ultrasound is employed for several medical and research purposes. Volcanic eruptions can be detected using Infrared sound. Depending on the medium through which it passes the sound the speed of sound changes. The speed of sound will move through solids. The physical properties of sound aren't constant through a medium.