Same chapter3 marksDifficulty: Medium
A ship sends a sound signal towards the sea bed and receives the echo after 3 s. If the speed of sound in sea water is 1500 m s−1, find the depth of the sea.
Sound
3 marksDifficulty: Medium
Why is the ceiling of a large concert hall often made curved?
Original Khojo Papers practice question — not from a past board paper.
Answer
A curved ceiling reflects the sound from the stage so that it spreads evenly and reaches every part of the hall with roughly the same intensity. Without it the sound would be much fainter at the back than at the front.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The hall also needs absorbing materials so that reverberation does not blur one sound into the next.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
What is the minimum distance from a reflecting surface at which an echo can be heard distinctly, if the speed of sound is 340 m s−1 and the ear can separate two sounds 0.1 s apart?
Sound
Same chapter3 marksDifficulty: Medium
Distinguish between natural, damped and forced vibrations.
Sound
Same chapter3 marksDifficulty: Medium
On what factors does the loudness of a sound depend, and on what does its pitch depend?
Sound
Same chapter3 marksDifficulty: Medium
A person claps and hears the echo from a cliff after 2 seconds. If the speed of sound is 340 m s−1, find the distance of the cliff.
Sound
Same chapter1 markDifficulty: Medium
For an echo to be heard distinctly, the reflecting surface must be at least:
Sound