i) Frequency of these sound waves is more than 20kHz
ii) Shorter wavelength
iii) They carry high amount of sound energy
iv) The speed of propagation of ultrasonic waves increases with increase in frequency
v) They show negligible diffraction
vi) Ultrasonic waves travel over long distance without considerable loss
vii) Ultrasonic waves undergo reflection and refraction at the separation of two media
viii) If it passed through fluid, then temperature of the fluid increases.
ix) Travel with constant speed through a homogeneous medium.
x) Posses certain vibrations which are used as good massage action in case of muscular pain.