Mathematics

Problem

A sound source

S

5\,\text{m}

from a flat vertical wall. A detector

D

3\,\text{m}

from the wall and

4\,\text{m}

horizontally to the right of

S

. After one reflection from the wall, the sound reaches

D

. Which of the following is closest to the angle of incidence on the wall (measured from the normal)? a)

63^{\circ}

37^{\circ}

26^{\circ}

45^{\circ}