(B) Flash bulbs are filled with oxygen gas and a thin wire of $Mg$ (magnesium). When the circuit is closed,the $Mg$ wire burns in the presence of oxyg

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(B) Flash bulbs are filled with oxygen gas and a thin wire of $Mg$ (magnesium). When the circuit is closed,the $Mg$ wire burns in the presence of oxygen to produce a brilliant white light. The chemical reaction is: $2Mg(s) + O_2(g) \rightarrow 2MgO(s) + \text{light energy}$.