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प्रश्न
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
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उत्तर
The ceilings of the concert hall are made curved so that sound, after reflection from the ceiling, reaches all parts of the hall and the speech can be easily heard even by the person sitting at a considerable distance. The curved surface of the ceiling reflects the sound of the speaker toward the audience and hence prevents the spreading of sound in various directions. Due to this, sound is distributed uniformly throughout the hall and even the person sitting at the back of the hall can hear the speech easily.
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संबंधित प्रश्न
Does sound follow the same laws of reflection as light does? Explain.
Name three devices which work on the reflection of sound.
Fill in the blank with suitable word :
An echo is simply a ................... sound.
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
What is an echo ? How is echo formed ?
A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo ? Speed of sound in air is 330 m/s.
Answer the following question in your own words.
What is an echo?
What is an echo?
State two conditions necessary for hearing an echo.
How can you calculate the speed of sound using echo?
