Q

What is the approximate minimum source-to-reflector distance for a distinct echo in air?

RRB Group-D 23/10/2018 (Shift-III) 2018
✓ Answer: C 17 m
Using a minimum delay of 0.1 s and speed near 340 m/s gives d = vt/2 ≈ 17 m. Options A and B are duplicated in the source.
← Previous Question Next Question →

📚 Related Questions

1 Which technique determines ocean depth and detects underwater hills, valleys, submarines and… 2 A force of 5 N accelerates one wooden block at 10 m/s²… 3 Which of the following statements best explains why striking a bell in… 4 Which statement best describes the application of the Right Hand Thumb Rule… 5 A planet has half Earth’s radius and half Earth’s mass. What is… 6 A staircase mainly acts like: