NCERT Solutions for Class 9 Science Chapter 12
Important NCERT Questions
Sound
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-175
Questions No-18
How is ultrasound used for cleaning?
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Ultrasonic Cleaning Process:
1. Equipment Setup: Ultrasonic cleaning involves a tank filled with a cleaning solution, typically water or solvent, where an ultrasonic transducer is immersed.
2. Ultrasonic Transducer Action: The transducer generates high-frequency sound waves (above the range of human hearing, around 20 kHz to several hundred kHz) and emits them into the cleaning solution.
3. Cavitation: The high-frequency sound waves create microscopic bubbles in the solution, a process called cavitation. These bubbles rapidly expand and collapse due to the alternating pressure from the sound waves passing through the liquid.
4. Cleaning Action: During the collapse phase (implosion) of these bubbles, intense scrubbing and agitation occur in the solution. This phenomenon generates microjets and vacuum bubbles that penetrate and dislodge dirt, grease, or contaminants from the surfaces of objects submerged in the solution.
Applications of Ultrasonic Cleaning:
– Industrial Use: In manufacturing, automotive, electronics, and healthcare industries for cleaning components, parts, machinery, and instruments.
– Jewelry and Watch Cleaning: Effective in removing dirt from intricate parts of jewelry, watches, and delicate items.
– Medical and Dental Equipment: Used to clean dental instruments, surgical tools, and medical equipment to ensure sterilization.
– Laboratory Equipment: Suitable for cleaning lab glassware, test tubes, and scientific instruments without causing damage.
Ultrasonic cleaning provides a gentle yet potent method for removing contaminants from surfaces, especially beneficial for delicate or complex items that are challenging to clean using traditional methods. This technology has diverse applications across various industries, ensuring thorough cleaning and maintenance of different types of equipment and objects.
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