KCET 2012 Physics Solved Paper

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Question : 7 of 60

Marks: +1, -0

Which of the following is incorrect ?

If the wave is longitudinal,it must be a mechanical wave.
If the wave is mechanical,it may OR may not be a transverse wave.
Mechanical waves cannot propagate in vacuum.
'Diffraction' helps us to distinguish between sound wave and light wave.

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