Question

A man is sitting in Gandhi Park of dimension 6m $\times$ 6m. On the left side of it, there is a building adjoining the park, and on the right side of the park, there is a road adjoining by park. A sound is produced on the road by a diwali bomb :

• A. the man will hear the echo of this sound
• B. no sound will be heard by the man
• C. no echo will be heard
• D. none

Answer 1

The correct option is C no echo will be heard

The minimum distance between source of sound and obstacle , to hear an echo is 17m , as the dimensions of the park are $l=6m,b=6m$ , therefore distance between road and building is 6m , therefore echo of the bomb sound will not be produced as distance between source of sound (bomb) and building is less than 17m i.e. echo will not be heard .