Surface water waves are generated in a ripple tank by a vibrating bar. The wavelength of the waves is $5.0\,\text{cm}$, and they move through a gap with width $20\,\text{cm}$. Which change would cause more diffraction to be observed?
- Adecreasing the distance between the bar and the gap
- Bdecreasing the frequency of the wave
- Cincreasing the amplitude of the wave
- Dincreasing the width of the gap