A cybernetic hand, that is powered by one's nerve impulses. 
        
                    
             
        
        
        
Transverse waves contain crests & troughs
while longitudinal waves contains compressions &rarefactions.
 
        
             
        
        
        
If you apply white light and it reflects only red, you see it red, all the other wavelentghs absorbed. If it reflects all wavelength (i think listed all red-orange....) then it should be white.