Give two applications of ultrasound.

(N/A) The two applications of ultrasound are as follows:
$(i)$ Ultrasound scanning: It is used for medical diagnostics,such as examining internal organs (e.g.,liver,gallbladder,uterus) and monitoring the development of a fetus during pregnancy.
$(ii)$ Detection of defects in metals: Ultrasound waves are used to detect cracks or flaws in metal blocks used in construction or manufacturing without damaging the structure.