"a shark is spotted near to Brighton beach, a lifequard will activate a siren to wa Siren The sound intensity, I, of the siren varies inversely with the square of the distance, d, from the siren, where d>0. It is known that at a distance of 1.5 metres from the siren, the sound intensity is 4 watts per square metre (Wm). (a) Show that 1= (b) Sketch the curve of / on the axes below showing clearly the point (I.5, 4). 20-

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