Alpha particles because two protons and two neutrons 
        
                    
             
        
        
        
It is considered to be a conductor 
        
                    
             
        
        
        
Product
Explanation:
Water in this reaction is called the product of the reaction. 
The product is the new kind of matter formed as a result of a chemical change. They are produced from the combination of reactants. 
                           2H₂  +   O₂        →        2H₂O
                            Reactants              Products 
A chemical reaction involves the combination of chemical species to form a product. The type of reaction above is a called synthesis reaction. 
learn more: 
Chemical equation brainly.com/question/5247791
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Answer:
mechanical energy to electrical energy to light energy