what are the uses of ultrasonic sound?

What are the used of lac?

What is the use of transformer

What are the use of fisheries?

what are the uses of sterling cycle.

Name the following Technology that uses ultrasonic sound waves to generate images of internal organs of the human body.

A bat flying above lake emits ultrasonic sound of 100 kHz ,When this wave falls on the water surface, it is partly reflected and partly transmitted .The wavelengths of the reflected and the transmitted waves are (The speed of sound in air is 340 m/s and in water is 1450 m/s)