Diffraction of sound. (Similar to Chapter 4, Exercise 4) A partially open window presents an opening 40 cm wide.

3. Diffraction of sound. (Similar to Chapter 4, Exercise 4) A partially open window presents an opening 40 cm wide.

a) What approximate frequency range of sounds from outside will go across the room in a well-defined beam? b) What approximate frequency range will spread evenly throughout the room?

c) Roughly what frequency marks the boundary between the two cases?