Physics (AS & A Level) · Feb / March 2022 · Paper 12 · Question 26

Water waves of wavelength λ are formed in a ripple tank. The waves are diffracted as they pass through a narrow gap of width d (d is greater than λ). Which gap width and which wavelength will cause the largest decrease in the amount of diffraction?

1. Agap width ½d, wavelength ½λ
2. Bgap width ½d, wavelength 2λ
3. Cgap width 2d, wavelength ½λ
4. Dgap width 2d, wavelength 2λ

As printed in the paper