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Tie the handle of this spoon at the midpoint of the spring 
wrap the ends of the spring around the index finger 
place ur finger  in ur ears 
lean over so that spoon hangs freely and swing the spoon so it taps against the door 
hit the door again, this time harder ,u can hear it as bell
                                                   hope it may help u . pls mark it as best ans if u like it 

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Ist recall the properties of metals.
Spoon is made up of metal and metals show th property of sonority that is they produces sound.
so thats why a spoon produce sound like a bell which is also madeup of metal.
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