1. The problem statement, all variables and given/known data 13. A man standing by the shore observes sea waves approaching at a frequency of 0.20Hz. A man on a boat observes that waves are approaching the boat at a frequency of 0.50Hz. The speed of the waves is 2.0ms–1. Which of the following gives a possible value for the speed of the boat and its direction? A) 3.0 ms^-1 away from the shore B) 3.0 ms^-1 towards the shore C) 1.2 ms^-1 away from the shore D) 1.2 ms^-1 towards the shore 2. Relevant equations f′= f[v/(v±u)] f′= f[(v±u)/v] 3. The attempt at a solution I tried to use the moving observer formula and moving source formula but neither worked :( Wave Phenomena: A parallel beam of light with a wavelength 600 nm passes through a single narrow slit and forms a diffraction pattern on a screen. The angle at which the first diffraction minimum is formed is 2.0 × 10–3 rad. What would be the angle of the first diffraction minimum for light of wavelength 400 nm? A. 3.0 × 10–3 rad B. 2.0 × 10–3 rad C. 1.3 × 10–3 rad D. 1.2 × 10–3 rad I don't know which formulas pertain to these, I would love some resources on this subject too, thank you!