Question

In a room, the reflected sound reaches the ear 0.05 s after its production. Will it produce an echo or reverberation? Justify your answer.

Answer 1

Reverberation. An echo requires a gap of at least 0.1 s between the original and reflected sound.

Here $$0.05 s < 0.1 s$$, so the reflected sound is not heard as a separate sound; it overlaps with the original sound and contributes to reverberation.