Same chapter3 marksDifficulty: Medium
Why is the ceiling of a large concert hall often made curved?
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1 markDifficulty: Medium
For an echo to be heard distinctly, the reflecting surface must be at least:
- a1.7 m away
- b17 m away
- c34 m away
- d170 m away
Original Khojo Papers practice question — not from a past board paper.
Answer
17 m away
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The ear separates two sounds 0.1 s apart, and in that time sound travels 34 m there and back.
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