A continuous progressive water wave in a ripple tank travels through an opening in a barrier and undergoes diffraction. The gap width is larger than the wavelength of the wave. Which alteration makes the wave spread out through a greater angle after it passes through the gap?
- Aa small decrease in the wavelength of the wave
- Ba small decrease in the width of the gap
- Ca small increase in the frequency of the wave
- Da small increase in the height of the barrier