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How is ultrasound used for cleaning ?...

How is ultrasound used for cleaning ?

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The object to be cleaned is placed in a cleaning solution. When ultrasound waves are passed through the solution, due to their high frequency, particles of dust, dirt and grease get detached even from the unreachable portions of the object and drop out in the solution.
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PRADEEP-SOUND-NCERT Exercise
  1. Cite an experiment to show that sound needs a meterial for its propaga...

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  2. Why is sound wave called a longitudinal wave ?

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  3. Which characteristic of the sound helps you to identify your friend by...

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  4. Flash ans thunder are produced simultaneously. But thunder is heard a ...

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  5. A person has a hearing range from 20 Hz to 20 kHz. What are the typica...

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  6. Two children are at opposite ends of an aluminium rod. One strikes the...

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  7. The frequency of a source of sound is 100 Hz. How many times does it v...

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  8. Does sound follow the same laws of reflection as light does ? Explain.

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  9. When a sound is reflected from a distant object, an echo is produced. ...

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  10. Give two practical applications of reflection of sound waves.

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  11. A stone is dropped from the top of a tower 500 m high into a pond of w...

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  12. A sound wave travels at a speed of 339 m//s. If its wavelength is 1.5 ...

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  13. What is reverberation ? How can it be reduced ?

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  14. What is loudness of sound ? What factors does it depend on ?

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  15. Explain how bats use ultrasound to catch a prey.

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  16. How is ultrasound used for cleaning ?

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  17. Explain the working and application of a sonar.

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  18. A sonar device on a submarine sends out a signal and receives an echo ...

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  19. Explain how defects in a metal block can be detected using ultrasound.

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  20. Explain how the human ear works.

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