Speed = wavelength * frequency 
Speed = 250 * 6
The speed is 1,500 m/s
        
             
        
        
        
Do you genuinely want help or ru trolling bc that’s actually common sense lol
        
             
        
        
        
The model of the atom which was supported by the gold foil experiment was nuclear model.
Scientists wanted to prove plum pudding model, however, their experiments led to interesting results which made them hypothesize the nuclear model of the atom instead.
        
                    
             
        
        
        
Concentration gradient across the membrane. Proteins in the membrane allow specific molecules through, passively.