Answer:
Here are the names and symbols 
H is Hydrogen 
Au is Gold 
Potassium is K
Mg is Magnesium 
Zinc is Zn
Iron is Fe
Cl is Chlorine 
Na is Natrium/Sodium
Copper is Cu
Ag is Silver
 
        
             
        
        
        
If you and the source of sound are moving apart, then the pitch (frequency) <em>you hear</em> is <em>lower</em> than the pitch (frequency) that's actually leaving the source.  
It doesn't matter whether you or the source is the one moving, only that the distance between you is increasing.
 
        
             
        
        
        
Answer:
Broadcasting is the method, not sure about the stage it is done in
Explanation:
 
        
             
        
        
        
Answer:
Anybody which is in state of rest ,will be in rest if we don't apply any external force ...