It is D as it is the only answer referring to weather and climate.
        
             
        
        
        
Answer:
1.10m/s
2.0.1m
3.5Hz
Explanation:
v=velocity, f=frequency and T=wavelength
1.v=ft
 v=2x5
 =10m
2.v=ft
 100=1000T
 divide both sides by 1000
 T=0.1m
3.v=fT
 25=5f
 divide both sides by 5
 f=5Hz
 
        
             
        
        
        
When a current flows through coil, magnetic field is produced around the coil which induces emf also known as back emf. When current in the coil is increased, more magnetic field is produced which in turn increases the induced emf.