The rope is shaken up and down, producing 3 waves every second. The waves have a wavelength of 1.2 metres.

State the frequency of the waves.
Hz
Calculate the speed of the waves.
Use the correct equation from the Physics Equations Sheet.
Show clearly how you work out your answer

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z