The directions in which
the sound is incident and reflected make equal angles with the normal to the reflecting surface at the point of incidence and the three lie in the same plane

The persistence of sound in an auditorium is the result of
repeated reflections of sound

The amount of sound energy passing each second through
unit area

The audible range of hearing for average human beings

The electrical signals sent to the brain to interprets them as sound

Law of relection of sound

Reverberation of sound

Intensity of sound

20 Hz - 20 kHz

Auditory nerve