12. please help

Waves produced by a moving object Diagram 1 Diagram 2 12. The diagram above that best illustrates the waves produced by an object moving to the left is . This diagram shows that, for a stationary object to the right of the moving object, the observed wavelength will be than if the source were stationary. The statement above is best completed by the answers in row: Row Diagram 1 larger Diagram 2 larger Diagram 2 smaller Diagram 1 smaller