Question

# What is ultrasound ? Explain how defects in a metal block can be detected , using ultrasound and explain how ultrasound is used to clean spiral tubes.

Solution

## The sound frequencies greater than $$20000\,Hz$$ are called ultrasonic waves or ultrasound. Human beings cannot hear ultrasound. Dogs, bats and dolphins can hear ultrasound. Due to very high frequency, ultrasound has greater penetrating power than ordinary sound. Detection of defects in metal blocks: In this process, ultrasound waves are allowed to pass through the metal block and detectors are used to detect the transmitted waves. Even if there is a small defect, the ultrasound gets reflected back, indicates the presence of the flaws or defect. Cleaning of spiral tubes: Ultrasonic waves are used for cleaning spiral tubes. The object to be cleaned is kept in the cleaning solution and the solution is subjected to the ultrasonic waves. The high-frequency waves stir up the dust/dirt particles. These particles get detached and the spiral tubes get thoroughly cleaned.Physics

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