Define ultrasound.

[A] : Ultrasound (in sonography ) is the sound beyond the range of human hearing [R] : Vibrations crysalts is the source of ultra-sound

A bat emits ultrasound waves of frequency 1000kHz in air. If the sound meets a water surface, what is the wavelength of the reflected sound. Speed of sound in air is 340ms^(-1) and in water 1486ms^(-1)

A bat emits ultrasound waves of frequency 1000kHz in air. If the sound meets a water surface, what is the wavelength of the transmitted sound in water? Speed of sound in air is 340ms^(-1) and in water 1486ms^(-1)

Define population.

Define stress.

Define strain.

Define saltation?