Diagram 1 shows a ripple tank experiment in which plane waves are diffracted as they pass through a narrow slit in a metal sheet. Diagram 2 shows the same tank with a slit that is wider. In both cases, the wave pattern arriving at the slit and the wave pattern after the slit are shown. Which action would make the waves in diagram 1 diffract less and therefore produce an emergent pattern closer to the one shown in diagram 2?
- Aincreasing the frequency of vibration of the bar
- Bincreasing the speed of the waves by making the water in the tank deeper
- Creducing the amplitude of vibration of the bar
- Dreducing the length of the vibrating bar