1.

A stone 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 amplitude of the wave varies as .....

Answer»

`r^((-1)/(2))`
`r^(-1)`
`r^(-2)`
`r^(-(3)/(2))`

SOLUTION :Intenstiy `I prop ("pressure")/("AREA" 4pir^(2))`
`E^(2) prop (P)/(4PI r^(2)) [ :. I prop E^(2)]`
where E is amplitude
`E^(2) prop (I1)/(r^(2)) ""` [ all terms are constant ]
`:.E prop (1)/(r)`


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