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Waves of higher frequencies are used for...

Waves of higher frequencies are used for cleaning hard-to-reach places. These are also used to detect and find the distance of object under water.
Mention one more use of these waves.

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For detecting cracks and flaws in metal blocks.
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  7. A sound wave travelling in a medium is represented as shown in the fig...

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  10. Where is reverberation desirable and where is this to be avoided ?

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  11. A narrow sound pulse (for example, a short pip by a whistle) is sent a...

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

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

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  19. Waves of higher frequencies are used for cleaning hard-to-reach places...

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  20. An observer notes that there is a 6 second interval between seeing a f...

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