<span>A fence runs all the way around the house but never moves.</span>
        
                    
             
        
        
        
To develop this problem it is necessary to apply the concept of Frequency based on speed and wavelength.
According to the definition the frequency can be expressed as

Where, 
v = Velocity 
 Wavelength 
Our value are given by,
v = 345m/s 

Replacing


Therefore the frequency of the tuning fork is 547.61Hz
 
        
             
        
        
        
<span> energy produced by flow of electric charge describes a electrical energy
because movement of electric charge do effect the work on system 
so correct option is B 
hope it helps</span>