Question

Sound waves with frequency 3000 Hz diffract out of a speaker cabinet with a 0.3 m diameter opening into a large auditorium. Velocity of sound in air is 343 m/s. Where does a listener standing against a wall 100 m from the speaker have the most difficulty in hearing? Assume single slit diffraction from a slit of width 0.3 m.

Answer 1

The first minima occur at B and B′ on two sides of the central maximum A (Fig. 13.4).