Four students A, B, C and D investigate how water waves diffract as they pass through a gap. Each student chooses a different gap width and a different wavelength for the water waves. Which student generates the waves with the greatest diffraction?
- Agap size $2.0\,\text{cm}$, wavelength $1.8\,\text{cm}$
- Bgap size $3.0\,\text{cm}$, wavelength $2.1\,\text{cm}$
- Cgap size $4.0\,\text{cm}$, wavelength $2.0\,\text{cm}$
- Dgap size $5.0\,\text{cm}$, wavelength $0.9\,\text{cm}$