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A) Why are sound waves called mechanical waves?

b) How will you differentiate high pitch sound to low pitch sound using graph?



A)This is because Sound waves cannot propagate in vacuum.. b) the one whose wavelength appears to be the least will have the highest pitch..
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I've written... Number b) "the one whose wavelength .... "
I need the picture of the graph
The graph that seems to be the most CONGESTED...
It is so because they need a material medium to travel. The lesser wavelength would be of a high pitched sound
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