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A strone thrown into still water, creates a circular wave pattern moving radially outwards. If r is the distance measured from the centre of the pattern. The amplitudeof the aves varies asA. `r^(-1//2)`B. `r^(-1) `C. `r^(-2)`D. `r^(-3//2 )` |
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Answer» Correct Answer - B The stone acts like a point source of light and producers spherical waves in 3 dimensions and circular wave in 2 dimensions. The intensity(I) due to a spherical wavefront at a distance r is proportional to `(1)/(r_2)` and the amplitude ` A prop (1)/r ` . In this case , r is the distance of the point from the centre of the pattern. `:. A prop r^(-1)` |
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