Q64 of 199 Page 208

Write any three applications (or use) of ultrasound.

The applications of ultrasound are:-

1) in industries to detect the flaws in metal block.

2) in hospitals to see the growth of fetus inside the mother’s uterus.

3) in hospital to detect the problems in liver, kidney.

A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo? Speed of sound in air is 33 m/s.

What is ultrasound? What is the difference between ordinary sound and ultrasound?

What are infrasonic waves? Name two animals which produce infrasonic waves.

What are infrasonic waves? Name two animals which can produce ultrasonic waves.