Give four practical uses of ultrasonic vibrations.
(N/A) $(i)$ They are used for dissipating fog on runways at airports.
$(ii)$ They are used in dishwashing machines to clean delicate objects.
$(iii)$ They are used for homogenizing milk.
$(iv)$ They are used for welding metals like tungsten.
$(ii)$ They are used in dishwashing machines to clean delicate objects.
$(iii)$ They are used for homogenizing milk.
$(iv)$ They are used for welding metals like tungsten.
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