Question: Spectators watch a fireworks display. When a particular firework explodes, high in the Sky, sound energy of 2 x 103 J is released in a

Spectators watch a fireworks display. When a particular firework explodes, high

Spectators watch a fireworks display. When a particular firework explodes, high in the Sky, sound energy of 2 x 103 J is released in a time of 3 x 103 s. (a) What is the sound power of this explosion? (1 mark) (b) Justify treating this as a point source of sound. (0.5 mark) (c) The spectators are a distance of 350 m away from the explosion. What sound intensity would they experience? (1.5 marks) (d) The World Health Organisation's recommendation for safe hearing is a maximum sound intensity level of 130 dB for a noise that lasts less than a second. Does this situation comply with the recommendation? (2 marks)

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